( after data = whole message) The rbl check was apparently not announced until after the whole message was received. Again, thanks everyone for the feedback. Otherwise if no mailbox is provided, then will return rejections for the authenticated account. I assumed that Sophos also scans all ip address within the mailheader. As we reviewed the rejections themselves and I looked in to the accounts on our Tenant, most (if not all) of the internal accounts ending in .mail.onmicrosoft.com are disabled accounts without licenses and the sending addresses appear to be some form of distribution list and others are something similar to: bounces+1605752-7050-=@mail8.shared..com (this address is identified as a bulkmailer). The best answers are voted up and rise to the top, Not the answer you're looking for? And, that occurs almost immediately - before the DATA command is accepted. URI To use this endpoint you send a POST request to: Mimecast will absolutely not do this for you on behalf of all of their clients. To do this: Access unmatched financial data, news and content in a highly-customised workflow experience on desktop, web and mobile. The start date of results to return in ISO 8601 format. @rod - Thanks. My understanding of greylisting was indeed incorrect. Your daily dose of tech news, in brief. Is the ip newly assigned to you? A pageToken value that can be used to request the next page of results. I'll be posting an update again soon. Linear regulator thermal information missing in datasheet. Jan 13 (Reuters) - Mimecast Ltd , the email security provider that announced a deal to go private last month, has rejected a higher offer from Thoma Bravo-backed Proofpoint due to antitrust risks . Are there any links in the email? the message is subject to greylisting). We've configured our Postfix to do this. Server Fault is a question and answer site for system and network administrators. Since Bob has already observed thst it is a content block, consistent with your data thst the block occurs after the message body is received, it is the message body (or subject line) that creates the problem. Lately my users are getting bounce backs from mimecast with error code 554 Email rejected due to security policies A signature was detected, which could either be a virus signature, or a spam score over the maximum threshold. Mimecast seems to be checking SPF records (which is good) but doing so when they are relaying large file sends (which is not good). We just recently implemented Mimecast and we are getting a lot of Envelope Rejected types. Does anyone else use Mimecast LFS and see issues with inbound emails? Allotments In Neath Port Talbot,
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