Hi,
I've recently switched hosting company and today for the first time have had trouble sending out an email via the Zen smtp server. I'm sending emails from my own domain, which is hosted by a third party. The DNS records look to be in order but I get the following error (only when I send to one particular address - so far) - I've *ed out the actual addresses, my domain is the *****.co.uk one...
"A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
***@********.org.uk
SMTP error from remote mail server after MAIL FROM:<****@*****.co.uk> SIZE=3339:
host easymx2.easily.co.uk [212.53.64.68]:
550-Verification failed for <****@*****.co.uk>
550-No such user at this domain
550 Unable to verify sender"
I know that the user exists because I use it for all my email and it sends and receives without problem for other recipients. I'm trying to work out if there's something with the way my hosting company deal with email addresses that could be causing this error or if there's a setting I'm missing in my mail client (Thunderbird).
Can anyone offer any suggestions?
Many thanks.