On 18. Dec 2018, at 07:18, Aki Tuomi <aki.tuomi@open-xchange.com> wrote:

On 18 December 2018 at 02:30 Adi Pircalabu via dovecot < dovecot@dovecot.org> wrote:

On 2018-12-18 07:33, Ruud Voorjans wrote:

Dear all,

I'm running dovecot # 2.3.2.1 - Pigeonhole version 0.5.2 () - OS:

Linux 4.18.0-12-generic x86_64 Ubuntu 18.10 with Submission.

It works great except with apple mail (Iphone).

I get an error with the MTA (postfix):

""postfix/submission/smtpd[32552]: warning: non-SMTP command from

mail.example.org [1][xx.xx.xx.xx]: Content-Transfer-Encoding: 7bit""

with other mail-client(s) (Outlook (Desktop and Iphone app)) i have no

problem and it proxy-sends the e-mail beautiful out to the recipient.

Hardly anything to do with Dovecot. When it comes to email clients Apple

Mail has been and is still one of the worst flops (no offence intended,

just my opinion based on personal experience). If you can reliably

reproduce it, try and log the raw SMTP conversation between Postfix and

the client by enabling per IP debugging in Postfix:

postconf -e "debug_peer_level = 20"

postconf -e "debug_peer_list = xx.xx.xx.xx"

postfix reload

where xx.xx.xx.xx is the unlucky client IP address.

Possibly some crappy SMTP PIPELINING implementation at the Apple end,

who knows.

--

Adi Pircalabu

It's not unconceivable that there are bugs in submission either. Can you provide doveconf -n and submission rawlogs? See https://wiki.dovecot.org/Submission for settings.

---
Aki Tuomi