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The SMTPUTF8 Extension

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yapadu View Drop Down
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    Posted: 31 December 2020 at 10:01am
Does Spam Filter support the SMTPUTF8 extension?

I have never heard of this extension before myself, but am having one domain that claims they can't receive mail from a specific sender.  The sender's server is reporting the following error:

SMTPUTF8 is required, but was not offered by host myhost.example.com[1.2.3.4]


Wondering if this is a problem with the sender or if SpamFilter does not have this extension supported?
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I am a user of SF, not an employee. Use any advice offered at your own risk.
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LogSat View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LogSat Quote  Post ReplyReply Direct Link To This Post Posted: 02 January 2021 at 11:10am
Hi yapadu,

SpamFilter does not support the SMTPUTF8 extension, and there are no plans to add it. The inability to send an email unless that extension is available is a problem with the sender. They would for example be unable to send emails to any @mac.com or @icloud.com Apple users, since Apple's mail servers do not support that extension either (if they did, "SMTPUTF8" would appear in the EHLO response):

nc -G 1 mx01.mail.icloud.com 25
220 iCloud SMTP - st11p00im-smtpin010.me.com 3.4.7 (2007B190-1b2e0e453944)
ehlo test.logsat.com
250-st11p00im-smtpin010.me.com
250-PIPELINING
250-SIZE 28311552
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250 CHUNKING
quit
221 2.0.0 Bye
Roberto Franceschetti

LogSat Software

Spam Filter ISP
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yapadu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote yapadu Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2021 at 6:37pm
Thanks for the clarification.
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