The SMTPUTF8 Extension |
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yapadu 
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Joined: 12 May 2005 Status: Offline Points: 297 |
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 Topic: The SMTPUTF8 ExtensionPosted: 31 December 2020 at 10:01am |
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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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LogSat
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Joined: 25 January 2005 Location: United States Status: Offline Points: 4104 |
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Posted: 02 January 2021 at 11:10am |
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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 |
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yapadu
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Joined: 12 May 2005 Status: Offline Points: 297 |
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Posted: 28 January 2021 at 6:37pm |
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Thanks for the clarification.
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