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This is a customized Jython procedure so it is better to ask Oracle Support about the error and it's resolution
Your email server can only accept email from the world (or from your Plone server) TO its domain, or it becomes a relay host and spammers take over. One solution is that the mail server might be able accept outbound email if you authenticate against it (see Site Setup, Mail Settings). Another solution is to explicitly tell your email server to accept (outbound) email relays from a specific ip address, such as your Plone box.
Simply defining your From address to be firstname.lastname@example.org might work in some cases
Thank you for your immediate replies.
Sorry, I didn't understand the part "..or it becomes a relay host and spammers take over.."
Yes, it is probably a restriction on the mail server, I can't log in using my account through the web browser. But I can send and receive mail from outside (like gmail) to my domain (from my account configured in outlook), and vice versa. Anyway, in my case, the from-address is something like email@example.com and the to-address is firstname.lastname@example.org
I didn't understand the part "..or it becomes a relay host and spammers take over.."
If you allow TO and FROM from your domain server, then your domain server will likely to be used as a relay for spammers etc. i.e your domain server will be used to send out spam (if they find it - and they probably will). When the spam police trace back the origins of the mail, it will be your domain server that they will find.
Emails generally do not get sent FROM your Domain server, they get sent via your mail out software (whatever it may be) TO the receivers Domain server.