Labeling everything that is auto-forwarded from a (non-Gmail) account
100016
How to create a filter in Gmail to identify messages forwarded from Zimbra?
155888
Is it possible to modify "from" field in mailto link?
157380
How can I create automatically expiring user accounts?
5904
Is there any way to modify the mail headers in an outgoing message sent using Gmail?
65553
Automatically remove "inbox" label from messages with other labels
96280
How to enforce sender address to be "logged-in-user@example.org" in Postfix?
108845
How do I base an outlook rule on the number of "To:" addresses?
74175
Remove Sender name ( not email address) from outgoing Mac Mail
125250
How can I filter incoming email based on plus addressing in Gmail?
14230
Create a Gmail filter for Calendar Notifications
143027
gmail email relay work around or alternatives
64587
Auto delete spam email from a domain in Gmail
124902
Protect email addresses in the user description from bots
145713
Gmail is marking my emails as SPAM. However, ISnotSPAM marks it as not-spam
52613
Can an account be manually unassociated from my network profile?
82063
Gmail and Hotmail marked as spam
153724
DKIM sign outgoing mail from any domain (with Postfix and Ubuntu)