CryptographicException in downloading mail message

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asked Mar 24, 2015 by franco_campanale (120 points)

I have the following error in downloading some mail messages:

System.Security.Cryptography.CryptographicException: Constructed 1X04NQ encountered.

We're using Rebex.Imap.dll v. 2.0.5171.0
Can somebody help me?

Applies to: Rebex Secure Mail

1 Answer

0 votes
answered Mar 24, 2015 by Tomas Knopp (58,890 points)

I see that you have an active support contract, so please update to the latest version, i.e. 2015R2 and then create a log of the communication using the LogWriter property. Either post the log here, or send it to

commented Mar 24, 2015 by Lukas Pokorny (124,970 points)
Actually, I guess that the version doesn't matter in this case. A log produced by your current version should be fine as well (no need to update yet).