In an Office 365 environment, one end user is unable to successfully send an e-mail to fax-numbered e-mail addresses. The format of such e-mail addresses is firstname.lastname@example.org.
But, the strange thing is that her co-workers are able to successfully e-mail to these fax-numbered e-mail addresses.
The end user receives no error messages. It's just that the recipient does not receive the e-mails.
Is there a setting of some sort that is preventing this one user from e-mailing to fax numbers?