Is there a way to determine if an recipient email address is invalid
2319
How to validate an email address using a regular expression?
150090
Should I sanitize an email address before passing it to the is_email() function?
87648
Is it possible to check if an email is confirmed on Facebook?
62307
How can I find out where an email really came from?
150408
scrlttr2: Position of the recipient's address
108845
How do I base an outlook rule on the number of "To:" addresses?
47955
Unidentified address in Gmail
66069
How do I create Test Data for an Org. Wide Email Address?
89965
How to retrieve email address of current user?
24002
Identify which OrgWideEmailAddress records are valid for current user
146606
How do I stop Outlook Out-Of-Office from replying to certain addresses?
1673
How do you make sure email you send programmatically is not automatically marked as spam?
56931
Apex email : How to override 'From address'
120667
Detecting Outlook autoreply/out-of-office emails
140073
Which email was the verification email sent to?
66665
How to prevent an email from accidentally being forwarded?
156426
False negatives when validating notification e-mails ("widespread sloppy coding establishes a [stricter] de facto standard than the formal standard")