Can SMTPUTF8 be turned off? It OFTEN breaks email-forwarding.
So I recently upgraded my Icewarp Windows server software from 13.0.3 to 14.1.0 - and suddenly those users of mine who have their emails forwarding to @yahoo and @aol (and others), are suddenly getting the following error when Icewarp attempts the forwarding:
Target server does not support SMTP UTF8
...and then the forwarding gets abandoned. Even worse, I provide MX Gateway spam filtering services for a few business, and those using MS Exchange are having this issue to. So now certain transactional emails are not getting to them.
Since it's extremely rare for an email sent to my users to even benefit from this new-ish feature - since very very few of them have the need for exotic or multi-language characters. Therefore, it is possible to turn this feature off? ...so that the original emails will then be send "the old way" when the original server sending to my server sees that this isn't in the list of supported features during the SMTP connection.
NOTE: I just want my server to NOT include this:
250-SMTPUTF8
...in the list of supported protocols at SMTP connection time.
If I can't find a fix for this, I might lose a significant amount of business. Since many Exchange servers don't support this, and the entire Yahoo/AOL system doesn't - that's MUCH forwarding that is broken due to this!
Any suggestions?
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Hi Rober,
the with EPOS added support of the SMTPUTF8 extension can be disabled.
IceWarp understand that not everybody is compatible with the mentioned extension, which is why they have added the possibility of disabling the extension.
To disable SMTPUTF8, please add value “!SMTPUTF8” to API c_mail_smtp_other_extensions.
Be aware that you need to open API on Server level, not on Domain or User to be able to adjust this. See the attached screenshot below:
BR David
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