I keep getting the error message "Relay Access Denied" when I try to send an email in Thunderbird.
I can receive email. My account settings/server info is correctly set up. When I try to send email, I get "An error occurred while sending mail. The mail server responded: 5.7.1: Relay Access Denied. Please check the message recipient and try again. I get this for all recipients. How do I fix this? I am running Thunderbird 52.9.1 on my Macbook Air with OS X 10.11.6. I tried to download the most recent version of Thunderbird 3 times but it errors out saying it is damaged and cannot be opened.
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What are your outgoing server settings? If you are, e.g., trying to send on port 25 with connection security = none, and are connected to a network that is not the same as the mail provider's, then you would see that kind of error.
For the 'damaged' error:
https://secure.clcbio.com/helpspot/index.php?pg=kb.page&id=323
TB and Firefox are both 'code-signed'.
The network is the same as the mail provider.
What are your outgoing server settings? Help/Troubleshooting Information, click 'Copy text to clipboard', paste here, omitting everything from the Graphics section to the end.