Horde is pretty confusing to begin with.
When using Kronolith (Calendar) to send out event invitations, Kronolith doesn't use the information in /usr/local/cpanel/base/horde/config/conf.php to send out mail.
Instead it tries to connect to 127.0.0.1 on port 25 and send out unauthenticated mails.
It does not attempt to use SMTP Authentication.
If you have /usr/local/cpanel/base/horde/config/conf.php set to use port 587 for sending out mail, it does not use that.
Steps to reproduce
Log into Horde Webmail account
Select New Event from Calendar
Add some email addresses in the Attendees tab
Save
Send updates to attendees? Select Yes
There was an error sending an event notification to [email protected]: Failed to set sender: [email protected] [SMTP: Failed to write to socket: not connected (code: -1, response: )]
Sending mail out through the Mail application in Horde works fine and as expected (through port 587 using the logged in credentials for SMTP Auth). But Kronolith - and perhaps other Horde Applications, do not.
There's a really old discussion about this on the Horde Mailing List:
https://marc.info/?t=137897806600003&r=1&w=2
It's from 2013. Seems to explain the issue I'm facing. But the discussion just seems to end without a resolution.
When using Kronolith (Calendar) to send out event invitations, Kronolith doesn't use the information in /usr/local/cpanel/base/horde/config/conf.php to send out mail.
Instead it tries to connect to 127.0.0.1 on port 25 and send out unauthenticated mails.
It does not attempt to use SMTP Authentication.
If you have /usr/local/cpanel/base/horde/config/conf.php set to use port 587 for sending out mail, it does not use that.
Steps to reproduce
Log into Horde Webmail account
Select New Event from Calendar
Add some email addresses in the Attendees tab
Save
Send updates to attendees? Select Yes
There was an error sending an event notification to [email protected]: Failed to set sender: [email protected] [SMTP: Failed to write to socket: not connected (code: -1, response: )]
Sending mail out through the Mail application in Horde works fine and as expected (through port 587 using the logged in credentials for SMTP Auth). But Kronolith - and perhaps other Horde Applications, do not.
There's a really old discussion about this on the Horde Mailing List:
https://marc.info/?t=137897806600003&r=1&w=2
It's from 2013. Seems to explain the issue I'm facing. But the discussion just seems to end without a resolution.
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