Mimecast can only deal with designated customer contacts. Recipient Graymail is also described by the phrase Bacn, (as in bacon). Fix NDR error code 550 5.4.1 in Exchange Online - Exchange Graymail is also described by the Select Blocked Senders. Solved: Bounce by Destination Server - Cisco Community A large percentage of the email submitted to Mimecast for analysis as spam is in fact legitimate marketing email with valid unsubscribe links. Graymail, or Gray Mail as it was called then, was defined as messages that could be considered either spam or good. This seems to be a common problem with SendGrid. Select the Gateway | Policies menu item. LDAP Configuration Not in Your Inbox Right Now Mimecast To remove invalid recipients or all recipients from your Auto-Complete list in Outlook 2010 later, see Manage suggested recipients in the To, Cc, and Bcc boxes with Auto-Complete. Its fair to say many end users consider newsletters that they opted-in to, mostly unknowingly, as spam even though they could easily unsubscribe from the senders distribution lists. Mimecast offers 6 types of recipient validation,these validation you will see them under the Internal Directories when registering a Domain. Mimecast The mail you want, but just not right now. To configure a Blocked Senders policy: Log on to the Administration Console. Active directory credential failure. Click on the Administration toolbar button. Your email address could be in the recipient's personally-maintained block list. To troubleshoot failed delivery, you can view information about the message and the reason for the bounce, and use this to address the cause and resend the message. Further attempts to send to the recipient will contribute to a poor reputation, which could impact delivery to recipients at other Mimecast customer domains. Mimecast overview and troubleshooting tips To resend the message in Outlook, see Resend an email message. If you receive any of the errors listed below when sending a message to a Mimecast customer, contact the recipient's Mimecast Administrator. Fix NDR error 550 5.1.0 in Exchange Online - Exchange I got this bounce message. The email that sits in this middle ground has become known as graymail.
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