Problem SMTP Server with mail.de Account

[ALKA889]

Hi all,

I got a problem with the SMTP server with my mail.de account.
I use AQUQ Mail on the HTC One (M7). The income server works without complications.  (imap.mail.de, SSL (strict) und Port 993)

But when I set up the SMTP Server (I used the settings written on the homepage of my email provider:  smtp.mail.de (STARTTLS (streng), Port 587)  there is an error. "Outgoing Mailserver (SMTP): invalid security certificate (SSL). No Peer certificates. Is your data correct?"

I tried all different options, but they all do not work.

Only if I set the outgoing mails on unencrypted I am able to send mails via Aqua Mail.

I use the same settings on my PC (Mozilla Thunderbird) without complaints. Now I tried the Mail App K9 as well and it worked fine.

Is there anyone with similar problems? How can I fix this bug?

I realy like Aqua Mail and it would be sad to drop it cause of this.

Alex

Edit:
I unticked the box of the SSL hardening  setting (settings-> network). Now it works...  Will these setting have any consequences for my security?

[ALKA889]

What are your exact settings in k9, port number, etc.?

It set up automatically:

IMAP.mail.de SSL Port 993

SMTP.mail.de STARTTLS Port 587, Authentification: Password, normal

The option password, normal is not available on Aqua Mail. Might this be the answer?

[Kostya Vasilyev]

Edit:
I unticked the box of the SSL hardening  setting (settings-> network). Now it works...  Will these setting have any consequences for my security?

Ok. I assume you didn't have "SSL hardening" or similar enabled in K9 or Thunderbird.

You could ask the server's admins to fix their SSL configuration.

About the implications -- personally I don't think it's a big deal, but of course stronger encryption is better than less strong encryption.