Hello
I've noticed that some emails that we send are not delivered. The same recipient get's email from two persons in the office when another person sends an email it's not being delivered with this message:
SMTP error from remote mail server after RCPT TO: 451
I've checked and it's actually fine when sending an email from web client, but it fails when sending from Outlook 2016 with IMAP/SMTP connection.
Any ideas what might be causing this issue?
Thanks
I've noticed that some emails that we send are not delivered. The same recipient get's email from two persons in the office when another person sends an email it's not being delivered with this message:
SMTP error from remote mail server after RCPT TO: 451
I've checked and it's actually fine when sending an email from web client, but it fails when sending from Outlook 2016 with IMAP/SMTP connection.
Any ideas what might be causing this issue?
Thanks