Sendig e-mail to domain with user e-mail is outside company domain - Email Spoofing
Hi, we are trying to solve an issue! Our SMTP config is delivering messages fine (All messages has been delivered), but we have some users (SU01) with e-mails like user@gmail.com ou user@outsidedomain.com. When they send e-mails for example using SO01 from their users (USER_EXT01 - email= userext01@gmail.com) to userext01@gmail.com, they get a message in Gmail MailBox as Spoofing message, and its right. We are not authorized do send mails as Gmail.com.
Companies that we have relationship wiht it, we already asked to adjust spf records at company´s Mail Servers , but others providers do that is a problem.
Are there any method to change sender e-mail or change domain when this kind of user are sending E-mails to company´s outside? Change the user e-mail address to an internal e-mail address is not an option.
Did anyone get this? Maybe could advice about that?