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An error occurred while sending mail. The mail server responded: 5.1.0 <firstname.lastname@example.org> Relaying denied. What is this error?
An error occurred while sending mail. The mail server responded: 5.1.0 <email@example.com> Relaying denied. Please verify that your email address is correct in your Mail preferences and try again.
I get this error every time I try to send a message. No problems with incoming messages. No problem if I use my webmail account mail.dataone.in
I have another webmail cum POP3 account which works fine both as webmail or through Thunderbird. I tried to replicate the Outgoing Server settings from this mail account to the Dataone account but it does not work.
I am using Thunderbird 24.5.0 and I am informed that I have the latest build as per the About Thunderbird tab.
Modified by James
All Replies (3)
A relaying error usually is sent by the respective mail server and isn't a Thunderbird problem.
If you use both mail accounts with Thunderbird, including the other mail account you mentioned, you may just apply the SMTP settings of the account that works to the one that doesn't, no need to replicate otherwise:
Account Setting > Outgoing Server SMTP (bottom) > choose seetings from dropdown
Note however that when using an SMTP server that is not the one set up by your ISP, generally you need to authenticate when using it, i. e. in
Account Settings > Outgoing Server (SMTP) > Edit
where you should check if you have set an authentication method with user name. Many mail providers require SMTP (outgoing mail) authentication anyway.
PS: allow me to note that e-mail addresses should not be quoted fully in forums (spam, privacy), you may want to remove/obfuscate it yet.
I later found that the emails are getting through by emailing a test email from this account to another account! Now I am totally flummoxed! Mail goes through but I keep getting this error message!
- Have you checked if SMTP is set to use authentication (see above)?
An article by this provider to a similar issue  basically says the same.
Modified by wuergler