bt email used as alias in gmail suddenly stopped sending mail

[seasider1]

i have been using my bt email as an alias in gmail for years set as the default address for sending mail. it stopped sending mail 2 days ago, still receives fine.  I have done everything i can find online incl checking settings, changing ports, removing the alias address and re-installing, deleting messages from the BT server (not that there were many).

In gmail it looks like the message has sent , it doesn't and I get a delayed error message stating 

421 Too many messages (2.3.5.3) from 209.85.167.41

it doesn't work whether I am sending to one recipient or up to 3 recipients.  Any ideas?

[gg30340]

Are you a BT Broadband customer or paying for your email through a BT Premium email account?

[seasider1]

broadband customer

[gg30340]

If you log onto the BTMail account directly bypassing gmail are you able to send and receive emails in the BTMail account?

[seasider1]

yep

[gg30340 · Accepted solution]

If it is working as it should when you use it without gmail it would appear that it could be a gmail problem rather than a BT problem.

You should try asking on the gmail forum to if they can help.

Gmail Community (google.com)

[seasider1]

thanks I have but no response yet.