So I inquired if GMX made any changed to their system here is what I received in reply:
As communicated, we have performed an update in our system and what you may have been experiencing is a service interruption as the settings in your device or mail program were not adjusted. In order to continue sending and receiving via an email program (e.g. Outlook/Thunderbird/Apple Mail), system (such us scanners/cameras/printers) or the native mail client in the mobile device please use the following values in your configuration:
SMTP Settings
* Server SMTP: mail.gmx.com
* Port SMTP: 25 or 587 or 465 (STARTTLS, TLS or encryption)
POP & IMAP Settings
* Server IMAP4: imap.gmx.com
* Port IMAP4: 143 or 585 or 993 (SSL or encryption)
* Server POP3: pop.gmx.com
* Port POP3: 110 or 995 (SSL or encryption)
I really don't see any difference from what I am using. Should I be able to email using original ELK firmware, I am not sure if STARTTLS, TLS qualifies as non-encrypted email supported by the original ELK firmware. I am reluctant to upgrade as it could create other issues with the setup that is working perfectly except for the email capabilities.
Thx