Topic: Recipient address rejected
Hello,
I have a problem only on one topic of my forum, it's a big topic (~6324 posts) and users have often the same problem when they wants to post in this topic :
An error was encountered
Error: Unable to send e-mail. Please contact the forum administrator with the following error message reported by the SMTP server: "550 : Recipient address rejected: Domain not found ".
The message is posted but users think not, so they repost... then there are 2 posts...
Email and other topic work good...
What can i do ?