A probably dumb question, but I'm stumped

[Antonio Leding]

Hello Christy,

Some quick thoughts here — if the changes you mentioned did not solve 
the issue, I would definitely comment those back out so you are only 
troubleshooting one thing at a time.

Next, are you able to send email using any other client?

Third, try disabling all SSL and see if you are able to send via 
Thunderbird or really, any client at all…

- - -

On 29 Nov 2020, at 12:31, Christy S wrote:

> Hi folks,
>
> I'm stumped on an error we're getting in dovecot after upgrading 
> ubuntu. I will say up front that I'm far from a linux expert. I'm 
> helping my husband by managing a virtual private server to handle his 
> domain, including its email. We set this up two years ago and once I 
> finally got the mail working, it's been humming along just fine since, 
> until two days ago when I performed the ubuntu upgrade. Now, when we 
> try to send mail through his domain thunderbird gives this error:
>
> Your message was sent but a copy was not placed in your sent folder 
> (Sent) due to network or file access errors.
>
> Note that it says this, but the mail isn't actually sent at all. We 
> are using SSL and have been since the beginning which might be part of 
> our problem, but I'm not positive.
>
> A google search suggested adding two lines to the 10-ssl.conf file.
>
> ssl_dh = </usr/share/dovecot/dh.pem
> ssl_cipher_list = HIGH:!DH:!aNULL
>
> I did both of these things and restarted the server completely, but no 
> luck. looking in /var/log/mail.err I see this.
>
> Nov 29 14:08:56 kylesmith-music dovecot: imap-login: Error: Failed to 
> initialize SSL server context: Can't load SSL cert
> ificate: error:140AB18F:SSL routines:SSL_CTX_use_certificate:ee key 
> too small: user=<>, rip=xxx.xxx.xxx.xxx, lip=xxx.xxx.xxx.xxx, 
> session=<t4qrdkS1kPNLFhL4>
> What's interesting is that last line only showed up after I added the 
> two lines to the config file.
>
> My guess is I need to do something with SSL, update it maybe? But I 
> don't want to go fiddling around purely on a guess and potentially 
> break things even more. So, any of you much more linux familiar types 
> want to point me in the right direction? Thanks!
>
> Christy
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