Mailing list is a feature to allow users to forward mails to multiple recipients within the same domain.
It may not work if the recipient members are from different domain.
This is due to the recipients' mail server will detect our IP address as the sender's IP address instead of the actual one, which may cause them to reject the mail due to various reasons.
For example, if the mail was sent from a Hotmail account, it will capture our IP address as the sender's IP address instead of Hotmail's IP, and send the mail to the mailing list members.
If one of the mailing list members is another Hotmail account, the mail will be rejected as the recipient's mail server detected that the sender was actually from their end, hence require authentication before sending out the mail.
The mail may also be rejected due to other reasons such as failed SPF checking and more.
Therefore, it is advisable to keep the mailing list members within the same domain to avoid mails from being rejected by recipients' side.
In MSPControl, the option "Require SMTP Authentication" should remain disable for mailing list.
This is because mailing list is a virtual email address that does not require any password during creation.
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