Dovecot not responding to external clients

[Edwin Humphries]

Hi all

I have Dovecot on my Linux-Mint workstation, running IMAP for the 
Thunderbird client thereon, but previously also for my phone and laptop 
clients as well. Since upgrading to Linux-Mint 19, however, although the 
Thunderbird client on the workstation works just fine, the other clients 
can't connect. I've disabled the firewall, and nmap shows the ports 
open, so it seems like some setting in the server. Can anyone help?

> Dovecot version is 2.2.33.2 (d6601f4ec)
>
> dovecot -n output:
>
> # 2.2.33.2 (d6601f4ec): /etc/dovecot/dovecot.conf
> # Pigeonhole version 0.4.21 (92477967)
> # OS: Linux 4.15.0-55-generic x86_64 Linux Mint 19.1 Tessa
> mail_location = mbox:~/mail:INBOX=/var/mail/%u
> mail_privileged_group = mail
> namespace inbox {
>   inbox = yes
>   location =
>   mailbox Drafts {
>     special_use = \Drafts
>   }
>   mailbox Junk {
>     special_use = \Junk
>   }
>   mailbox Sent {
>     special_use = \Sent
>   }
>   mailbox "Sent Messages" {
>     special_use = \Sent
>   }
>   mailbox Trash {
>     special_use = \Trash
>   }
>   prefix =
> }
> passdb {
>   driver = pam
> }
> protocols = " imap"
> ssl_cert = </etc/dovecot/private/dovecot.pem
> ssl_client_ca_dir = /etc/ssl/certs
> ssl_key =  # hidden, use -P to show it
> userdb {
>   driver = passwd
> }
>

-- 

Regards,
Edwin Humphries

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