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Having trouble sending or receiving email? Try Switching to Port 587

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Having trouble sending or receiving email? Try Switching to Port 587

IMPORTANT ACTION MAY BE REQUIRED - If you are having trouble sending or receiving email using your email software (Windows Vista Mail, Outlook, Outlook Express, Thunderbird, etc.,) try switching your outbound port to 587.


Here’s why.  The majority of spam (unsolicited email) on the Internet is caused by malicious software viruses that take control of infected computers. These viruses direct the infected machines to send email through port 25.  Outbound port 25 blocking is a standard industry method to control spam.


Next Tuesday, November 11, 2014, HughesNet will join the majority of ISPs in blocking traffic to port 25, preventing infected computers from being used by spammers to send unsolicited email.


If you get a message that your outbound mail server cannot be found or does not exist, or you get connection failures and disconnects, try switching your outbound email port from port 25 to port 587.


Here’s how –

For Microsoft Outlook or Outlook Express email:

·         On the Tools menu, click Accounts.

·         On the Mail tab, click your Internet Mail account, and then click Edit.

·         On the Account Settings tab, click here for advanced sending options, and then type the port number for your SMTP (or sending) mail.

For more information on Changing SMTP port 25 in Microsoft Outlook:


For Mozilla Thunderbird:

·         Open Mozilla Thunderbird.

·         Go to Tools > Account Settings.

·         In the list on the left, select Outgoing Server (SMTP) at the bottom of the list.

·         Select the account you need to change from the list on the right and click edit.

·         Then, change port from 25 to 587.

For more information on changing SMTP port 25 in Thunderbird:



You’ll find other email client switching procedures on your email client’s support site.


Not only does Port 587 apply to sending and receiving email, but also provides added benefits such as built-in encryption for user ID login and passwords, to aid in the thwart against identify thieves and hackers.  If you need additional help, feel free to ask the community or one of our live agents any time at 866.347.3292.

Assistant Professor

Thank you Warren, done, tested, working on Thunderbird.
Honorary Alumnus

Strange thing ..... three Hughes mail accounts, two presently use port 587 for outgoing and work as expected.

The third uses port 465. When changed to 587 and sending a test mail the operation times out.

Thunderbird 31.2.0

Assistant Professor

Hmm, maybe recreate the account? Or switch to port 25 save, then switch to 587.
Honorary Alumnus

Failed at 25.

Rather not delete then recreate the account due to all the subfolders and archived messages associated with that account within Thunderbird.

Warren, any thoughts as to port 465 being viable after the 11th ?



Hi Gwalk -

Port 25 is the only thing being closed - you should have no issues with 465 after the 11th. On another note, if you are switching from secure port 465 to 587, you might have to uncheck the SSL feature on Thunderbird. Let us know how that goes!


Assistant Professor

Amanda, I went from 25 to 587 and still have STARTTLS enabled.
Honorary Alumnus

I got it to work with the following settings:


Assistant Professor

That's how mine is set.  🙂