[Users] Sending mail hangs when using PGP MIME

[Andrej Kacian]

On Fri, 13 Oct 2017 15:03:34 +0000
Mark Raynsford <list+org.claws-mail at io7m.com> wrote:

> On 2017-10-13T15:38:57 +0100
> Paul <claws at thewildbeast.co.uk> wrote:
> >
> > That seems to look fine, we see Claws doing
> > 
> > [13:38:43] SMTP> . (EOM)
> > 
> > I read a thread with what sounds like the same problem. Here the OP
> > says it was down to mismatched MTU settings on router and network
> > card. It seems a long shot but, hey, here it is:
> > 
> > https://www.howtoforge.com/community/threads/postfix-timeout-after-data-from-some-emails.39635/  
> 
> Thanks very much for this! It looks like it might very well be the
> problem.
> 
> I recently deployed IPv6 to my network and because the router is now
> using PPPoE, the MTU on the outgoing link is 1492 rather than the
> conventional 1500 (this is a limitation of PPPoE, apparently). What's
> not entirely clear to me is why I haven't seen any "Packet Too Big"
> errors. I'll look into it further.
> 

This is a very problematic topic, see recent article on Cloudflare blog:
https://blog.cloudflare.com/ip-fragmentation-is-broken/

-- 
Andrej
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