On Wed, 2021-10-20 at 15:57 -0400, Viktor Dukhovni wrote: > On Wed, Oct 20, 2021 at 03:24:12PM -0400, fp145 wrote: > > > I use evolution as my mail client on the laptop. > > Are you using TLS? Either port 587 with STARTTLS, or port 465 with > "implicit TLS" (some MUAs confuse things by calling this "SSL", and > reserve "TLS" for "STARTTLS"). > > > Oct 20 21:16:57 libertyfp postfix/smtpd[175562]: connect from > > 87.sub-174-212-171.myvzw.com[174.212.171.87] > > Oct 20 21:16:59 libertyfp postfix/smtpd[175562]: F0DEF3FFFD: > > client=87.sub-174-212-171.myvzw.com[174.212.171.87], > > sasl_method=LOGIN, > > sasl_username=fp...@libertyfp.org > > I don't see logging of a TLS session establishment there, and you > really > should be encrypting sessions that transmit passwords. > > > Oct 20 20:07:49 libertyfp postfix/smtpd[174025]: warning: hostname > > ip245.tervelnet.com does not resolve to address 87.246.7.245 > > Oct 20 20:07:49 libertyfp postfix/smtpd[174025]: connect from > > unknown[87.246.7.245] > > Oct 20 20:07:51 libertyfp postfix/smtpd[174025]: warning: > > unknown[87.246.7.245]: SASL LOGIN authentication failed: > > UGFzc3dvcmQ6 > > Perhaps your Evolution client is doing reverse resolution on the > server > IP address before deciding which password to send to the server in > question? [ That would be a really bad idea, use a better MUA if > that's > the case. ] > > The issue is surely on the client end, and the reason Exim succeeds > may > have more to do with how the particular IP addresses resolve over the > VPN, than the software runnign on the server. > > When the VPN is up find out what IP addresses both servers resolve > to, > and what those IP addresses back to (PTR records). > > You're probably searching for clues on the wrong side of the VPN. > Troubleshoot the client, not the server.
Just a quick follow-up. You were absolutely right. The initial setup was on port 25 using STARTTLS. Changing to port 465 using TLS in the client fixed the problem. I apologize for not replying earlier, but I ended up going on a cross-country trip and then getting COVID, so I was out of commission for a month. billo >
