> 15. apr. 2022 kl. 16:24 skrev Al Iverson via mailop <[email protected]>:
> 
> PPS- Don't send to Gmail over IPv6.

I would rather say «don’t try to send to gmail over IPv6 unless you have a 
correct reverse DNS for your IPv6 address». Google apparently decided to raise 
the bar a little when it comes to receiving over IPv6.

I just sent as a test the message preserved at 
https://www.bsdly.net/~peter/somebody_mentioned_ipv6.eml.txt 
<https://www.bsdly.net/~peter/somebody_mentioned_ipv6.eml.txt> which was 
delivered over IPv6, as the headers will show, so it’s definitely possible.

I have however at times seen people with gmail accounts either not getting 
messages from my domains at all or only finding them in the spam folder, when 
my logs record the messages as accepted by the Google servers.

I would most certainly have preferred some sort of error message, but that 
appears not to be Google’s way of doing things.

The domain’s reputation in Google’s view may have been tainted by their 
classifying some automatically generated mail *about* spam activity as spam. I 
was originally somewhat reluctant to mention those episodes, but for those 
bored witless and curious the bounces are archived at 
https://home.nuug.no/~peter/googlefail/ 
<https://home.nuug.no/~peter/googlefail/>. It’s even possible that some of the 
items at the first link in my signature has more information in a field notes 
type of style.

- Peter

—
Peter N. M. Hansteen, member of the first RFC 1149 implementation team
http://bsdly.blogspot.com/ http://www.bsdly.net/ http://www.nuug.no/
"Remember to set the evil bit on all malicious network traffic"
delilah spamd[29949]: 85.152.224.147: disconnected after 42673 seconds.




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