Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Cannot send mail

leif.hammarstrom
leif.hammarstrom

Sending a mail results in the following message:

Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: Disallowed HELO string.

Sending a mail results in the following message: Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: Disallowed HELO string.

Okulungisiwe ngu leif.hammarstrom

Isisombululo esikhethiwe

Found the solution in

https://kb.mozillazine.org/Replace_IP_address_with_name_in_headers

Funda le mpendulo ngokuhambisana nalesi sihloko 👍 0

All Replies (1)

leif.hammarstrom
leif.hammarstrom Umnikazi wombuzo

Isisombululo Esikhethiwe

Found the solution in

https://kb.mozillazine.org/Replace_IP_address_with_name_in_headers