Spam Filter ISP Support Forum

  New Posts New Posts RSS Feed - The SMTPUTF8 Extension
  FAQ FAQ  Forum Search   Register Register  Login Login

The SMTPUTF8 Extension

 Post Reply Post Reply
Author
yapadu View Drop Down
Senior Member
Senior Member


Joined: 12 May 2005
Status: Offline
Points: 297
Post Options Post Options   Thanks (0) Thanks(0)   Quote yapadu Quote  Post ReplyReply Direct Link To This Post Topic: The SMTPUTF8 Extension
    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?
--------------------------------------------------------------
I am a user of SF, not an employee. Use any advice offered at your own risk.
Back to Top
LogSat View Drop Down
Admin Group
Admin Group
Avatar

Joined: 25 January 2005
Location: United States
Status: Offline
Points: 4104
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
Back to Top
yapadu View Drop Down
Senior Member
Senior Member


Joined: 12 May 2005
Status: Offline
Points: 297
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.
--------------------------------------------------------------
I am a user of SF, not an employee. Use any advice offered at your own risk.
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.191 seconds.