This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

An error occurred while sending mail. The mail server responded: 5.7.1 ... Command rejected.

user1809616
user1809616
more options

An error occurred while sending mail. The mail server responded: 5.7.1 <marc.bunya@e-denen.net>... Command rejected. Please verify that your email address is correct in your account settings and try again. I have checked all the settings with my ISP. I even deleted the original account then added a fresh one with the settings as told to me by my ISP. No go. Security settings are Connection security: None and Authentication method: Encrypted password (this is what the ISP recommended) POP mail server. Port 110. Outgoing SMTP server Port 587 (again as per ISP instructions). MY ISP tech support has run out of ideas! Any suggestions? I can receive email on this account but cannot send.

An error occurred while sending mail. The mail server responded: 5.7.1 <marc.bunya@e-denen.net>... Command rejected. Please verify that your email address is correct in your account settings and try again. I have checked all the settings with my ISP. I even deleted the original account then added a fresh one with the settings as told to me by my ISP. No go. Security settings are Connection security: None and Authentication method: Encrypted password (this is what the ISP recommended) POP mail server. Port 110. Outgoing SMTP server Port 587 (again as per ISP instructions). MY ISP tech support has run out of ideas! Any suggestions? I can receive email on this account but cannot send.

Chosen solution

re :Authentication method: Encrypted password (this is what the ISP recommended) Set to 'Normal Password'. Username is usually the full email address.

Read this answer in context 👍 0

All Replies (2)

Toad-Hall
Toad-Hall
  • Top 10 Contributor
more options

Chosen Solution

re :Authentication method: Encrypted password (this is what the ISP recommended) Set to 'Normal Password'. Username is usually the full email address.

user1809616
user1809616 Question owner
more options

Thank you. Problem solved. The ISP fixed it on their side, so I don't know exactly what the problem was or how they solved it.