Author: Anton Date: To: Exim-users Subject: Re: [exim] GMail and TCP Fast Open
On 2021-12-03 12:00, Andrew C Aitchison wrote: >
> I am just passing on, with permission, something exim related
> from the mailop@??? list.
Thank you, Andrew, that helped me a lot.
This issue appeared for me some time ago -- all messages *with attachments* (even small ones) sent to Google MX (and only to them) are timed out. They were all getting delivered but with delays of 0.5 to several hours.
I have few such mails per hour, no bulk sending, DKIM and DMARC (and DANE) configured.
With TCP Fast Open disabled they are now delivered immediately.
