Android Question SMTP 503 "sender not given yet"

Which mode do you want to use? Either StartTLSMode or UseSSL should be true. Not both of them.

Such errors usually occur because of the wrong authentication mode.

Hi Erel!

Thanks for your answer.
I have tested with all combinations. Nothing works. I think the reason is the "Reply to" field with no email-address inside. Is it possible to set this field?

best regards
Hagen

I'm pretty sure that this error is not related to the reply to field.

Are you able to send emails from the desktop with this server? If yes then you can use a tool such as wireshark to monitor the network traffic and then post the exact messages (without any sensitive information).

Hi Erel!

I have installed wireshark and tested it with the desktop outlook. The provider supports also unencrypted connections so i have everything turned off (also on my smartphone!) The desktop connects and transfer the mail, the smartphone means theat the sender is not given. In moment i have no emulator on my pc and the switch does not support port-mirroring, so i can not use wireshark to read the smartphone-data. my pc-data looks like the following:

220 mi4 ESMTP
EHLO hagenPC
250-mailin04.ims-firmen.de Hello hagenPC [ip]
250-SIZE 1048576000
250-8BITMIME
250-PIPELINING
250-AUTH PLAIN LOGIN CRAM-MD5
250-STARTTLS
250 HELP
AUTH LOGIN
334 ----removed-----
334 ----removed-----
235 Authentication succeeded
MAIL FROM: <mysourcemail@mail.de>
250 OK
RCPT TO: <mysourcemail@mail.de>
250 Accepted
DATA
354 Enter message, ending with "." on a line by itself
From: Microsoft Outlook <mysourcemail@mail.de>
To: <mydestmail@mail.de>
Subject:----removed-----
MIME-Version: 1.0
Content-Type: text/html;
charset="utf-8"
Content-Transfer-Encoding: 8bit
---Message----

...and the mail arrives correctly.

I have found a similar entry in your forums, the result was a provider-change. In the last consequence i will do it also, but i think the failure must be to found.

best regards.
Hagen

If you like you can send me the credentials by mail and I will test it.

Seems like the user name is not correct. I've tested it with B4J. This makes it easier to monitor the network traffic:

Thanks Erel!

The provider does not support eMail-adresses als login-names. The provider means that the sender eMail must set separatly. I use an other provoder to solve this problem. I have tested gmail and everything is ok.

best regards
Hagen