Probably blackilsted due to spammers.
If your mail service provider is not MTN, use their own SMTP server for outgoing mail, not MTN. It works only with authentication, login/password is usually the same as for incoming mail.
Probably blackilsted due to spammers.
If your mail service provider is not MTN, use their own SMTP server for outgoing mail, not MTN. It works only with authentication, login/password is usually the same as for incoming mail.