[horde] Can't send to BCC or CC without To: using activesync

[Simon Wilson]

----- Message from Brent <impuser at bitrealm.com> ---------
    Date: Sun, 24 Jan 2021 12:46:13 -0800
    From: Brent <impuser at bitrealm.com>
Subject: [horde] Can't send to BCC or CC without To: using activesync
      To: horde at lists.horde.org


> Trying to send an email with ONLY the BCC field filled out using  
> ActiveSync.  Device says "the message was rejected by the server".   
> Same happens with CC-only filled out and omitting the To: field.
>
> Checking the horde logs, I find:
>
> NOTICE: HORDE PHP ERROR: Undefined index: To [pid 1278 on line 305  
> of "/usr/share/pear/Horde/Core/ActiveSync/Mail.php"
>
> Line 305 is this:
>  $recipients = $h_array['To'];
>
> Function area:
>
>  protected function _sendRaw()
>     {
>         $h_array = $this->_headers->toArray(array('charset' => 'UTF-8'));
>         $recipients = $h_array['To'];
>         if (!empty($h_array['Cc'])) {
>             $recipients .= ',' . $h_array['Cc'];
>         }
>         if (!empty($h_array['Bcc'])) {
>             $recipients .= ',' . $h_array['Bcc'];
>             unset($h_array['Bcc']);
>         }
>
> Seems that $h_array['To'] is undefined and it bombs out?
>
> Not sure of the proper fix for this.  I can send email using  
> Horde/Imp with only the CC or BCC field filled out, this only seems  
> to be happening using an ActiveSync device.
>
> brent
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----- End message from Brent <impuser at bitrealm.com> -----

FWIW I just tested this using my Horde ActiveSync connection, using  
Nine as the email client on Android, and successfully sent an email  
with only a BCC address in the destinations.

Simon.

-- 
Simon Wilson
M: 0400 12 11 16