My ISP might be filtering port 25, I have no idea.
BUT, I’m NOT connecting to my ISP as the mail log show.
I connect directly to the recipients SMTP and get the right reply.
That’s why I find suspicious that I get a bounce where the ISP is mentioned.

Unless they, considering this is Thailand, is intercepting network traffic if 
that is even possible.
I wouldn’t be too surprised.



> On 10 Sep 2023, at 15:42, postfix--- via Postfix-users 
> <postfix-users@postfix.org> wrote:
> 
>> Sep 10 12:21:39 wopr postfix/smtp[25425]: 94E7840E5C: 
>> to=<recipi...@gmail.com>, 
>> relay=gmail-smtp-in.l.google.com[74.125.130.27]:25, delay=0.85, 
>> delays=0.03/0.04/0.56/0.22, dsn=2.0.0, status=sent (250 2.0.0 
>> 38A5LeYj001108-38A5LeYl001108 Message accepted for delivery)
> 
>> Reporting-MTA: dns; spamfilter-02.totbroadband.com
> 
>> What’s suspicious here is the "Reporting-MTA: dns; 
>> spamfilter-02.totbroadband.com” line.
> 
> 
> 
> Man in the middle? Your ISP filtering port 25 with good intentions?
> 
> Try a telnet connection to those host (gmail/mail-tester) on 25 and see who 
> actually answers.
> 
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