Roundcube Community Forum

Release Support => Release Discussion => Topic started by: ascilite_secretariat on October 15, 2025, 08:08:18 PM

Title: Roundcube and Postmark.com smtp mail server
Post by: ascilite_secretariat on October 15, 2025, 08:08:18 PM


Hi all..

Newbie to the community here.

I'm trying to set up roundcube to use smtp from postmark.com

On our hosting platform I've set up a subdomain and, using cpanel, and installed roundcube to the subdomain. It seems to be working (well the index.php url renders the roundcube login interface). In the installation steps I added the smtp server, port etc as provided by postmark.com.

When I get to the roundcube login page I'm using the username and password provided by postmark.com. The login fails.

The error in the log file reads (I've changed the identifies with [placeholders])

IMAP Error: Login failed for [postmarkusername] against smtp-broadcasts.postmarkapp.com from [myIPaddress]. Could not connect to smtp-broadcasts.postmarkapp.com:143: Connection refused in /home/[my subdomaindetails]/program/lib/Roundcube/rcube_imap.php on line 211 (POST /?_task=login&_action=login)

So that looks, to this newbie, like roundcube is passing the username to the IMAP port.

Can I tell roundcube to just use the SMTP details?

Many thanks
Roger







Title: Re: Roundcube and Postmark.com smtp mail server
Post by: SKaero on October 15, 2025, 11:50:43 PM
The Roundcube UI is built around IMAP so without a IMAP login Roundcube will not work. SMTP is only for sending mail.