550 Access Denied Invalid Helo Name

550 Access Denied Invalid Helo Name. According to the off doc it means the following reject_invalid_helo_hostname (with Postfix < 23 reject_invalid_hostname) Reject the request when the HELO or EHLO hostname is malformed Note specify “smtpd_helo_required = yes” to fully enforce this restriction (without “smtpd_helo_required = yes” a client can simply skip reject_invalid_helo_hostname by not sending HELO or EHLO).

If you are receiving “550 Access denied – Invalid HELO name” (or a similar error message) in your email client it means that you have not enabled SMTP authentication Our servers require authentication for outbound email please check your settings as follows Microsoft Outlook From the Menu Bar Click Tools then Click Email Accounts.

Solution: 550 Access denied Invalid HELO name HostUpon

A “550 Access Denied – Invalid HELO name” SMTP error usually occurs when the SMTP Domain configured as part of an email sender’s identity does not match the senders email address To modify the SMTP Domain name associated with your sender identity in GroupMail do the following.

Email sending error: 550 Access denied Invalid HELO name

Our Systems Team has begun implementing the requirement of SMTP authentication on our servers that may affect customers using an email client such as Thunderbird Outlook or Mac Mail If you are receiving “550 Access denied Invalid HELO name” (or a similar error message) in your email client please check your settings as follows Microsoft Outlook.