Puzzled with outlook 2012 and outlook for Mac can receive but cannot send!

Lets see if someone can help me

I can send and download emails with any email clients. However with outlook 2012 and outlook 2019 for mac I can receive no probekm with ssl, however i cannot send emails no matter waht i do I have tried all possible combinations with no luck (ssl 587, ssl 465, no ssl 25) mail.domain.com, domain.com, mail.serverdomain.com.I have run out of ideas. Please help
Just happens with outlook

this is the error:

Nov 26 18:05:41 localhost postfix/smtpd[24558]: NOQUEUE: reject: RCPT from static-219-51-27-46.ipcom.comunitel.net[46.xx.xx.xxx]: 554 5.7.1 bbbbb@xxxxx.com: Relay access denied; from=xxxx@axxxxx.com to=bbbbb@xxxxx.com proto=ESMTP helo=