Was your email falsely being detected as spam over the weekend?

We have received several reports over the weekend that customers email has been flagged as spam by some receiving mail servers.

Bounce backs included errors such as:

<– 554 The IP Address of the sender (1.2.3.4) was found in a DNS blacklist database and was therefore refused.

<– 550 Email blocked by bl.spamcop.net (in reply to RCPT TO command)

On closer investigation it appears there was a system outage at the Cisco SpamCop DNS-based blocking service and the underlying cause was that the spamcop.net domain name had failed to be renewed.

More information on this issue can be found at the following link:

https://www.theregister.com/2021/02/01/in_brief_security/

Switching to Modern Authentication mode in MailStore

Since MailStore Version 13 it is now possible for Microsoft 365 customers to tighten up their security by utilising Microsoft’s Modern Authentication integration.

But what changes have been made and how easy is it to convert a MailStore installation over from using Basic Authentication?

Before we begin lets first look at the two modes of Authentication with Microsoft and how they differ.

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