Send Mail does not work from IOS Mail using (EAS)

[hbsimon]

Hi,
I couldn't find any mailing list or group to ask this.
I am using debian bookworm with apache 2.4.62, postfix and dovecot for my mail. I am trying to get z-push v 2.75. working for imap. It does connect to the imap server fine and displays the mailbox with all folders and their content correct, but fails to send an email using smtp. I tried following settiings in the IMAP backend config.php:
define('IMAP_SMTP_METHOD', 'smtp');
$imap_smtp_params = array('host' => 'tls://127.0.0', 'port' => 587, 'auth' => true, 'username' => 'imap_username', 'password' => 'imap_password', 'allow_self_signed' => 'true', 'verify_peer' => 'false', 'verify_peer_name' => 'false',);
or
$imap_smtp_params = array('host' => '127.0.0.1', 'port' => 587, 'auth' => true, 'username' => 'imap_username', 'password' => 'imap_password', 'allow_self_signed' => 'true', 'verify_peer' => 'false', 'verify_peer_name' => 'false',) ;

The Client shows "Cannot Send Mail Check the settings for the outgoing servers in Settings > Apps > Mail >Accounts

The Client is native IPhone 12 Pro Mail on IOS V 18.4.1

The logs for z-push don't show any entries even in Debug Mode, it appears that it didn't connect at all. Anyone out there has this working and can please share configuration details or let me know where else to check/configure.

Horst

[matidau]

The mail-in-a-box has a working config file
https://github.com/mail-in-a-box/mailinabox/blob/main/conf/zpush/backend_imap.php

[hbsimon]

I tried this, but still didn't work, too my mailserver is using port 587 and not 465. IMAP connections are working for the IMAP Clients. Sofar what I can see is that it doesn't even try to connect to the server and even DEBUG logging is enabled there are no log entries at all. Is there any place I can drop my configuration files for an expert to look at them?

[hbsimon]

I have some more information. I think that the issue is between the IOS native mail client and z-push, that during configuration the send part from the configuration is not picked up by IOS mail. I tried the Mail app Blue Mail for Iphone and this one is working.
The IOS native mail app send part work with ActiveSync from Horde.