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Outgoing e-mails are rejected with “Unable to relay”

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Dear NoSpamProxy customers,

since a few hours we see in customer environments that send outgoing e-mails from O365 via NoSpamProxy the error “Unable to relay”. We found that Microsoft uses a new certificate to identify all Office 365 email servers, which was issued by a GlobalSign CA rather than Microsoft’s own CA. The NoSpamProxy security check to see if the server is a valid “company e-mail server” fails and the e-mails are rejected. A new Fast Channel Version is available to fix this issue.

We apologize for any inconvenience caused.

Your NoSpamProxy Team

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Wie sicher ist E-Mail-Verschlüsselung?

How Secure is Email Encryption?

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The #Efail debate has caused great uncertainty among users and IT departments regarding the effectiveness of email encryption. Headlines such as S/MIME and PGP hacked were not only factually incorrect, but also led some self-proclaimed experts to advise against the use email encryption in general. The fact that the problem is not S/MIME or PGP itself was completely ignored. In reality, encryption is bypassed by getting the email client to send the plain text of the email to the attacker.

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Welche Möglichkeiten der E-Mail-Verschlüsselung gibt es?

Possibilities of Email Encryption

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Emails are a common part of our private and professional communication. However, there seems to be no awareness of the vulnerability of each individual email sent. In many cases, emails travel across a variety of servers and countries, regardless of whether the recipient lives on a different continent or just on a different floor in the same building. The structure of the internet makes this possible.

As a result, anyone with the neccessary technical knowledge can intercept, read or even change emails at any node during transport. And he or she can write emails in your name.

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How to use SPF-authenticated servers in “Corporate email servers”

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How to use SPF-authenticated servers in “Corporate email servers” Similar to Microsoft Exchange, some NoSpamProxy features can only be enabled through a PowerShell cmdlet. Specifying an “SPF-authenticated corporate email server” is one such feature. Entries of this kind facilitate the maintenance of NoSpamProxy enormously. “Corporate email servers” define the servers of a company that are […]

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What’s really behind the General Data Protection Regulation?

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The General Data Protection Regulation (GDPR) aims at harmonising the handling of personal information by organisations. Numerous organisations are already working on implementing and conforming to the individual items of the GDPR. But what’s really behind the GDPR?

Oliver Schonschek, journalist specialised in IT, uncovers common myths circulating online and answers the most important questions.

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