Ionos - 1and1 (Cannot send email)

Hi hope you are all well with this Covid ans stay safe and healthy.

Anyone can help me regarding the issue that from my server all the emails accounts i have hosted, cannot send email to email accounts/domains hosted at 1and1 or Ionos

Appreciate any help.

I am running cyberpanel 2.0

Thanks a lot

Only happens with them, may be my mail server ssl? i ahve various domains and you can only issue one

Sorry, I mean everytime i start email cliente gives me warnings about the ssl of the mail server. i.e i have the mail server ssl as, however other domains have their own (with their own ssl issued)

Also today i encouter that when i try to access the cyberpanel gices me this error:

Internal Error

The server encountered an unexpected condition which prevented it from fulfilling the request.

This is the error qwith 1and1

host[] said:
550-Requested action not taken: mailbox unavailable 550 invalid DNS MX or
A/AAAA resource record (in reply to MAIL FROM command)

I am checking the logs

They are fine, made a test with

and reults are ok

not working