Hi all,
We have a aspx.net site which send out mail to users using a web server hosted externly.
This have been working perfectly for a couple of years sending 100-1000 mails pr day, but recently users have started to report that they do not recieve mails - some days they recieve all mails (2-100) and some days only 40-60%.
All mails are formatted equal and have the same content (except for some dynamic fields like name, password etc).
I've looked at my error log and now I see this error when mails are lost:
system.net.mail.smtpexception: transaction failed the server response was: <[email protected]> Relay access denied
Any feedback would be appriciated.
Regards and happy coding, Thomas