Recently had a customer stop being able to send items to Mimecast with the following 554 Email rejected due to security policies - https://community.mimecast.com/docs/DOC-1369#554This was happening to Multiple emails […]
Tag: mimecast
Whitelist an IP Address in Mimecast
If you are using products such as Cofense PhishMe , FriendlyPhishing or Knowbe4 as Phish testing software in your organisation then these test’s will get blocked in […]
Mimecast : The attached files listed below have been blocked. This is because they contain potentially harmful links. If you believe this is a mistake, please contact your administrator.
The attached files listed below have been blocked. This is because they contain potentially harmful links. If you believe this is a mistake, please contact your administrator.This […]
Mimecast Recommended SPF, DKIM and DMARC settings – DNS Inbound Authentication
https://community.mimecast.com/docs/DOC-2545#jive_content_id_Inbound_DNS_Authentication_Policy_Configuration You can also tighten down SPF to only allow specific email address to send from third party services instead of whole domain : https://www.jamieweb.net/blog/using-spf-macros-to-solve-the-operational-challenges-of-spf/
Mimecast – Connection Attempt – Attempt Greylisted
Find the email in Administration – Gateway – TrackingSee : Connection AttemptGo to Administration – Monitoring – ConnectionsSee : Attempt GreylistedGo to : Gateway – Policies – GreylistedAdd new Policy […]