A United States Postal Service (USPS) mail carrier walks through heavy rain as Tropical Storm Fay sweeps across the heavily populated northeastern United States in Jersey City, New Jersey, U.S., July 10, 2020. REUTERS/Mike Segar

A U.S. Postal Service mail carrier walks past the closed and empty Lincoln Center in Manhattan during the outbreak of the coronavirus disease (COVID-19) in New York City, New York, U.S., May 21, 2020. REUTERS/Mike Segar

U.S. President Donald Trump presents a "Presidential Message of Appreciation" to 23-year-old mail carrier Kyle West of Cincinnati, Ohio for his actions delivering essential supplies requested by the elderly people living along his mail route, during a coronavirus response event in the Blue Room at the White House in Washington, U.S., May 1, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump presents a "Presidential Message of Appreciation" to 23-year-old mail carrier Kyle West of Cincinnati, Ohio for his actions delivering essential supplies requested by the elderly people living along his mail route, during a coronavirus response event in the Blue Room at the White House in Washington, U.S., May 1, 2020. REUTERS/Carlos Barria

U.S. President Donald Trump listens as 23-year-old mail carrier Kyle West of Cincinnati, Ohio speaks during a coronavirus response event in the Blue Room at the White House in Washington, U.S., May 1, 2020. REUTERS/Carlos Barria

A United States Postal Service (USPS) mail carrier pushes his cart while delivering mail in the rain on Manhattan's Upper West Side during the outbreak of the coronavirus disease (COVID-19) in New York City, New York, U.S., April 13, 2020. REUTERS/Mike Segar

A United States Postal Service (USPS) mail carrier pushes his cart while delivering mail in the rain on Manhattan's Upper West Side during the outbreak of the coronavirus disease (COVID-19) in New York City, New York, U.S., April 13, 2020. REUTERS/Mike Segar

A United States Postal Service (USPS) mail carrier pushes her cart while delivering mail in the rain on Manhattan's Upper West Side during the outbreak of the coronavirus disease (COVID-19) in New York City, New York, U.S., April 13, 2020. REUTERS/Mike Segar

A United States Postal Service (USPS) mail carrier pushes his cart while delivering mail in the rain on Manhattan's Upper West Side during the outbreak of the coronavirus disease (COVID-19) in New York City, New York, U.S., April 13, 2020. REUTERS/Mike Segar

Mail carrier Tiffany Sufficool delivers the mail during subzero temperatures carried by the polar votex in Fargo, North Dakota, U.S., January 31, 2019. REUTERS/Dan Koeck

Mail carrier Tiffany Sufficool delivers the mail during subzero temperatures carried by the polar votex in Fargo, North Dakota, U.S., January 31, 2019. REUTERS/Dan Koeck

Mail carrier Tiffany Sufficool delivers the mail during subzero temperatures carried by the polar votex in Fargo, North Dakota, U.S., January 31, 2019. REUTERS/Dan Koeck

A carrier of French mail services La Poste rides his delivery bicycle in Nice, France, June 4, 2018. REUTERS/Eric Gaillard

A carrier of French mail services La Poste delivers mail in Nice, France, June 4, 2018. REUTERS/Eric Gaillard

A carrier of French mail services La Poste rides his delivery bicycle in Nice, France, June 4, 2018. REUTERS/Eric Gaillard

A carrier of French mail services La Poste delivers mail in Nice, France, June 4, 2018. REUTERS/Eric Gaillard

A carrier of French mail services La Poste rides his delivery bicycle in Nice, France, June 4, 2018. REUTERS/Eric Gaillard

A carrier of French mail services La Poste rides his delivery bicycle in Nice, France, June 4, 2018. REUTERS/Eric Gaillard

Mail carrier Monica Plummer looks for someone to sign for their mail in the empty offices of Cambridge Analytica in Washington, D.C., U.S., May 2, 2018. REUTERS/Leah Millis

US Navy sailors sort mail in the hangar on the USS Harry S. Truman aircraft carrier in the eastern Mediterranean Sea June 15, 2016. REUTERS/Baz Ratner SEARCH "USS HARRY S. TRUMAN" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

US Navy sailors sort mail in the hangar on the USS Harry S. Truman aircraft carrier in the eastern Mediterranean Sea June 15, 2016. REUTERS/Baz Ratner SEARCH "USS HARRY S. TRUMAN" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

Prince Philip, Duke of Edinburgh visit the Queen Elizabeth II delivery office in Windsor with Prince Philip, Duke of Edinburgh on April 20, 2016 in Windsor, Britain. The visit marks the 500th Anniversary of the Royal Mail delivery service. The Queen and Duke of Edinburgh are carrying out engagements in Windsor ahead of the Queen's 90th Birthday tommorow. REUTERS/Chris Jackson/Pool

WINDSOR, ENGLAND - APRIL 20: Queen Elizabeth II meets postmen as she visits the Queen Elizabeth II delivery office on April 20, 2016 in Windsor, Britain. The visit marks the 500th Anniversary of the Royal Mail delivery service. The Queen and Duke of Edinburgh are carrying out engagements in Windsor ahead of the Queen's 90th Birthday tommorow. REUTERS/Chris Jackson/Pool

WINDSOR, ENGLAND - APRIL 20: Queen Elizabeth II shares a joke with postmen about their shorts as she visits the Queen Elizabeth II delivery office on April 20, 2016 in Windsor, Britain. The visit marks the 500th Anniversary of the Royal Mail delivery service. The Queen and Duke of Edinburgh are carrying out engagements in Windsor ahead of the Queen's 90th Birthday tommorow. REUTERS/Chris Jackson/Pool

Queen Elizabeth II shares a joke with postmen about their shorts as she visits the Queen Elizabeth II delivery office in Windsor with Prince Philip, Duke of Edinburgh on April 20, 2016 in Windsor, Britain. The visit marks the 500th Anniversary of the Royal Mail delivery service. The Queen and Duke of Edinburgh are carrying out engagements in Windsor ahead of the Queen's 90th Birthday tommorow. REUTERS/Chris Jackson/Pool

Queen Elizabeth II meets postmen as she visits the Queen Elizabeth II delivery office in Windsor with Prince Philip, Duke of Edinburgh on April 20, 2016 in Windsor, Britain. The visit marks the 500th Anniversary of the Royal Mail delivery service. The Queen and Duke of Edinburgh are carrying out engagements in Windsor ahead of the Queen's 90th Birthday tommorow. REUTERS/Chris Jackson/Pool

A postwoman standing beside a scooter uses a device in front of the headquarters of Poste Italiane in Milan, Italy, October 22, 2015. Poste Italiane is expected to report Q3 results this week. REUTERS/Stefano Rellandini/FilesGLOBAL BUSINESS WEEK AHEAD PACKAGE - SEARCH "BUSINESS WEEK AHEAD NOV 9" FOR ALL IMAGES

An employee of German mail carrier Deutsche Post attends a demonstration in Munich, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Michael Dalder

Employees of German mail carrier Deutsche Post attend a demonstration in Munich, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Michael Dalder

The logo of German mail carrier Deutsche Post is seen during a demonstration in Munich, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Michael Dalder

The logo of German mail carrier Deutsche Post is seen next to a red traffic light during a demonstration in Munich, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Michael Dalder

The logo of German mail carrier Deutsche Post is seen next to a red traffic light during a demonstration in Munich, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Michael Dalder

Letterboxes of German mail carrier Deutsche Post are seen during a demonstration in Munich, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Michael Dalder

The logo of German mail carrier Deutsche Post is seen next to a red traffic light during a demonstration Munich, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Michael Dalder

Trucks of German mail carrier Deutsche Post are parked during a demonstration Munich, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Michael Dalder

Pushbikes of German mail carrier Deutsche Post are parked during a demonstration Munich, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Michael Dalder

The logo of German mail carrier Deutsche Post is seen next to a red traffic light during a demonstration Munich, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Michael Dalder

Verdi union leader Frank Bsirske addresses the employees of German mail carrier Deutsche Post during a demonstration outside the company headquarters in Bonn, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Wolfgang Rattay

Verdi union leader Frank Bsirske addresses the employees of German mail carrier Deutsche Post during a demonstration outside the company headquarters in Bonn, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Wolfgang Rattay

Employees of German mail carrier Deutsche Post attend a demonstration of Verdi union members outside the headquarters in Bonn, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Wolfgang Rattay

A German flag with a logo of German mail carrier Deutsche Post is pictured outside the Deutsche Post headquarters during a demonstration of Verdi union members in Bonn, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Wolfgang Rattay

A Jolly Roger flag is pictured outside German mail carrier Deutsche Post headquarters during a demonstration of Verdi union members in Bonn, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Wolfgang Rattay

Employees of German mail carrier Deutsche Post march towards the headquarters during a demonstration of Verdi union members in Bonn, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. The text 'Appelcalypse now' on the banner is a word play referring to Deutsche Post CEO Frank Appel. REUTERS/Wolfgang Rattay

An employee of German mail carrier Deutsche Post blows into a post horn during a demonstration of Verdi union members in Bonn, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Wolfgang Rattay TPX IMAGES OF THE DAY

An employee of German mail carrier Deutsche Post blows into a post horn during a demonstration of Verdi union members in Bonn, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Wolfgang Rattay

Employees of German mail carrier Deutsche Post carry a banner with a picture of company's CEO Frank Appel as they march towards the headquarters during a demonstration of Verdi union members in Bonn, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. The text translates as 'We won't let us to be fooled.' REUTERS/Wolfgang Rattay

Employees of German mail carrier Deutsche Post march towards the company's headquarters during a demonstration of Verdi union members in Bonn, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Wolfgang Rattay

A German flag with a logo of German mail carrier Deutsche Post is pictured outside the Deutsche Post headquarters during a demonstration of Verdi union members in Bonn, Germany, June 18, 2015. Workers at Deutsche Post are on strike over labour union Verdi's demands in a dispute over pay and conditions. REUTERS/Wolfgang Rattay

A dog is seen as employees of German mail carrier Deutsche Post attend a rally during warning strikes in Munich April 2, 2015. German union Verdi extended strikes into a second day in protest against management plans to expand the group's parcel delivery business by using employees on lower pay deals, a trade union said. REUTERS/Michael Dalder

Employees of German mail carrier Deutsche Post attend a rally during warning strikes in Munich April 2, 2015. German union Verdi extended strikes into a second day in protest against management plans to expand the group's parcel delivery business by using employees on lower pay deals, a trade union said. REUTERS/Michael Dalder

Employees of German mail carrier Deutsche Post attend a rally during warning strikes in Munich April 2, 2015. German union Verdi extended strikes into a second day in protest against management plans to expand the group's parcel delivery business by using employees on lower pay deals, a trade union said. REUTERS/Michael Dalder

Employees of German mail carrier Deutsche Post attend a rally during warning strikes in Munich April 2, 2015. German union Verdi extended strikes into a second day in protest against management plans to expand the group's parcel delivery business by using employees on lower pay deals, a trade union said. REUTERS/Michael Dalder

Employees of German mail carrier Deutsche Post attend a rally during warning strikes in Munich April 2, 2015. German union Verdi extended strikes into a second day in protest against management plans to expand the group's parcel delivery business by using employees on lower pay deals, a trade union said. REUTERS/Michael Dalder

Employees of German mail carrier Deutsche Post attend a rally during warning strikes in Munich April 2, 2015. German union Verdi extended strikes into a second day in protest against management plans to expand the group's parcel delivery business by using employees on lower pay deals, a trade union said. REUTERS/Michael Dalder

Employees of German mail carrier Deutsche Post attend a rally during warning strikes in Munich April 2, 2015. German union Verdi extended strikes into a second day in protest against management plans to expand the group's parcel delivery business by using employees on lower pay deals, a trade union said. REUTERS/Michael Dalder

Employees of German mail carrier Deutsche Post attend a rally during warning strikes in Munich April 2, 2015. German union Verdi extended strikes into a second day in protest against management plans to expand the group's parcel delivery business by using employees on lower pay deals, a trade union said. REUTERS/Michael Dalder

Employees of German mail carrier Deutsche Post attend a rally during warning strikes in Munich April 2, 2015. German union Verdi extended strikes into a second day in protest against management plans to expand the group's parcel delivery business by using employees on lower pay deals, a trade union said. REUTERS/Michael Dalder

A postman of Japan Post rides a motorcycle in Tokyo, February 18, 2015. Financial giant Japan Post Holdings Co Ltd launched its global expansion strategy with its largest ever deal on Wednesday, agreeing a A$6.5 billion ($5.1 billion) takeover of Australian freight and logistics firm Toll Holdings Ltd. REUTERS/Issei Kato (JAPAN - Tags: BUSINESS)

Mail carrier Marissa Ogletree delivers mail in the historic Pullman neighborhood in Chicago November 20, 2014. U.S. President Barack Obama is expected to announce the designation of the Pullman neighborhood as a national park on February 19, according to park advocates. The neighborhood's brick homes and ornate public buildings were built in the 1800s by industrialist George Pullman as a blue-collar utopia to house workers from his sleeper car factory. Picture taken November 20, 2014. REUTERS/Andrew Nelles (UNITED STATES - Tags: SOCIETY ENVIRONMENT POLITICS)