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I am setting up a Canon iR device to scan to email, but their field name for SMTP server is too short for my MX record address.

Is there a way to set-up an alias that would work round this, or some other method?

Why is my MX so long? Because I am using Office 365 so it is of the format “MyDomain-with-dashes.mail.protection.outlook.com” (so adding 28 characters to by domain name).

Canon's field seems to be a maximum of 48 characters. I've logged a support request with Canon but cannot conceivably expect a resolution from them.

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  • I would point them to RFC 2821 section 4.5.3.1 and ask which part of 256 characters they found difficult to understand.
    – kasperd
    Jan 13, 2017 at 21:51

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You might be able to work around this problem by creating a CNAME in your own domain that resolves to the O365 name. For instance:

canon-sucks     IN      CNAME   example-com.mail.protection.outlook.com.

Then provide canon-sucks.example.com to the device.

Chances are good that this will work; however, if they're that bad at writing Internet software, then who knows...

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Use the IP address!! Duh. Thanks anyway.

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    You can't reliably use the IP address, because it can and will change.
    – Michael Hampton
    Jan 13, 2017 at 20:43

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