[Bradford] Email server config problems

[Devo Too]

Hi again Folks,

To reflect the overwhelming number of responses to my help request - 
zero in fact - are any of you, or do any of you know, a freelance 
sysadmin who is likely to be bale to sort this problem out? There are a 
few online but their profiles are a bit thin on detail so it's hard to 
judge whether they can do this without reading up as they go.

I suspect only half an hour to an hour's work for somebody who knows 
what they are doing. I have managed to rule out T'bird by using 
Evolution and getting "network unreachable" errors. T'bird is still 
serving the old email server as I have only transferred a couple of 
domains across so far. I don't suspect my connection because everything 
else works fine, emails, web searches, site lookups, shell access to 
servers.

So it really is down to a server based setting, whether firewall, 
security setting or Postfix or Dovecot setting. All I need is the 
accurate diagnosis. My eyeballs are spinning round in opposite 
directions from reading from this screen for too long.

Cheers,

Mike

On 29/11/2019 15:34, Devo Too via Bradford wrote:
> Hi Folks,
> 
> Any postfix/dovecot gurus out there? This tutorial 
> https://thomas-leister.de/en/mailserver-debian-stretch/ helped create 
> the server this email is coming from, on Debian Stretch. It was done 
> successfully with few if any problems on the way.
> 
> It's time to move from that old creaking server onto one with Debian 
> Buster. So the email server is built is built from the same tutorial but 
> it won't allow T'bird to log in.
> 
> After a lot of reading of man pages, web pages and config files, the 
> nearest I have come to anything which may offer a clue (although I do 
> suspect it's an error in an as yet unidentified postfix or dovecot 
> config file) is a Debian site discussion where the person who had a 
> similar, but not the same, fault cured it temporarily by knocking 
> "reject" off the ends of a block of lines in postfix's main.cnf file. 
> But if my understanding is correct, each line will only be followed by 
> the system as far as the next implementable command. So having reject on 
> the end should be after it could be operated (postfix should have done 
> something else and moved on before it got that far).
> 
> However, there is an MUA block where each line ends in "reject". IIUC, 
> T'bird is an MUA (Mail User Agent). Could the word be deleted in each 
> instance, replaced with something else, or is that likely to be a red 
> herring so leave it alone?
> 
> Any other suggestions for tracing where the fault may lie? Any 
> suggestions for an alternative mail client which could be run to see if 
> the fault is with T'bird itself? Not Mutt or Pine though. That would 
> just be another (to me) incomprehensible manual to read
> 
> TIA,
> 
> Mike
>