Good morning,
may I ask you for advice with a three beginner questions? I am new to
postfix, and I do not want to catch bad habits early on..
1) I was surprised, that when I install postfix as "internet computer", it
switches on TSL support. Postfix generates certifikate and key in
/etc/ssl/certs/ssl-cert-snakeoil.pem and
/etc/ssl/private/ssl-cert-snakeoil.key itself?
2) I comment out TSL in main.cf and telnet from one of my client computers
(lets call it "PC1", Windows XP and default telnet). Connections was closed
immediately with error 421. In mail.log it was always the same...
connect from unknowx[xx.xx.xx.xx]
lost connection after EHLO from unknowx[xx.xx.xx.xx]
disconnect from unknowx[xx.xx.xx.xx]
...while localhost and another computer ("PC2", Windows XP and default
telnet) was connecting and working all right. First time it wasnt working,
even if I turned TLS back on as it was before change and reload postfix. So
I reinstall whole Postfix and now with TLS on, PC1 and PC2 connects
allright. When I turn TLS off in main.cf, PC1 disconnects again (?) as i
mentioned above, and PC2 is connecting all right, as if nothing had
happened. Why is this happening?
3) I have postfix on server for forwarding incoming massages from
virtual_alias_domains and virtual_alias_maps + sending outgoing only from
localhost (server reports). Is TLS useful in this case?
Thank you very much for your help. Best regards
M. Rysa
