Cannot send emails

[kinzl]

I cannot send emails both from web application and Outlook client in PC. it says error 554 Sender address rejected.
Can somebody help please.
Thanks!

[JohnDoh]

Sounds like you have an issue with your smtp server settings. from the error i'd guess you need to configure smtp authentication but you should ask your provider for the correct settings.

[kinzl]

OK! Thanks!

You mean my internet/WIFI provider? Sending of emails does not work on any of connections I have been in last week

[JohnDoh]

I mean the people who run your email.