MailBee.NET Objects Releases

Released: Oct 19, 2021

Updates in v12.3


Updated Nov 23, 2022


  • Now includes OAuth 2.0 support for Microsoft Office 365 accounts (non-interactive mode).
  • Tutorial and sample code on Office 365 OAuth 2.0 Credentials Flow (non-interactive) for IMAP/POP3.
  • Improved conversion of signed/encrypted messages from EML to Microsoft Outlook MSG.
  • Miscellaneous TLS 1.2 and TLS 1.3 improvements.
  • Added SHA265RSA support in S/MIME.
  • Improved RTF-to-HTML conversion (Outlook MSG to EML).


Updated Oct 19, 2021


  • Added TLS...

Released: Sep 14, 2020

Updates in v12.2.x


Updated Sep 14, 2020


  • Adds Microsoft Office 365 OAuth 2.0 support (developer guides and samples available for desktop and Microsoft ASP.NET Core apps).
  • Improves Microsoft Outlook MSG conversion.
  • Improves S/MIME verification of attached signatures.
  • Improves ESMTP CRAM-MD5 authentication.
  • Improves documentation.

Released: Oct 29, 2019

Updates in v12.1.x


Updated Dec 2, 2019


  • DNS MX lookup mechanism can read UDP packets of the maximum size.
  • Bounce database improvements.


  • S/MIME verification fix with attached signatures.
  • LINK HREF now honored when saving HTML content with embedded images (embedded CSS styles are now saved as well).


Updated Oct 29, 2019


  • A set of S/MIME methods for encryption/decryption, signature verification, working with certificates in Windows-independent way (can be used in UWP and other non...

Released: Jul 23, 2019

Updates in v12.0


  • .NET Core 2.0 / .NET Standard 2.0 edition revised and improved, including better support of .NET Core 2.1 and 2.2.
  • .NET Standard 2.0 support in UWP. UWP apps targeting Windows 10 Fall Creators Update and newer can use the fully-functional .NET Standard 2.0 edition of MailBee.NET Objects. Special UWP edition of MailBee.NET Objects which can work with older UWP platform is still there as well.
  • .NET Core 2.0 sample projects and tutorials added (UWP, console and ASP.NET Core). They feature...

Released: Oct 23, 2017

Updates in v11.2


  • Brings features previously available only in classic .NET Framework 4.5 edition, to .NET Core 2.0, including:
    • BounceMail component (parser of bounced e-mails).
    • Verification of e-mail addresses in bulk mode.
    • Mail merge over database.
  • UWP edition can now be used in Release builds.
  • Multiple SMTP enhancements:
    • Empty MAIL FROM is now allowed for SMTP.
    • No extra CRLF in the end of DATA transmission in SMTP.
    • MAIL FROM now includes SIZE if the SMTP server limits the size of messages being...

Released: Jun 6, 2017

Updates in v11.1


  • New RblFilter class to perform spam filtering using DNS RBLs.
  • Better support of certificates in .NET Core and Xamarin. Can now use client certificates in SSL/TLS connections and DKIM.
  • Imap.SetSeenForEntireMessages is now false by default. This means MailBee won't set SEEN flag when downloading entire messages unless you change this property value.
  • New Global.DnsServers property to override the default list of DNS servers assigned for the current system. Useful if DNS server...

Released: Mar 14, 2017

Updates in v11.0


  • .NET Core edition, .NET Core 1.0/1.1, .NET Standard 1.3 and Xamarin compatible.
  • UWP edition (Universal Windows, UAP 10.0).
  • New Ews component, provides access to MS Exchange server via its native EWS protocol.
  • .NET Framework 3.5 and 4.0 builds in addition to 2.0 and 4.5 builds are now included with the installer and in NuGet package.
  • Many more methods now have async/await versions.
  • sha256 signatures in addition to sha1 for all MailBee.NET dlls.
  • IDN domains (e-mail addresses with...

Released: Mar 10, 2015

Updates in this release

Updates in 9

  • OAuth 2.0 now works via the Google API Auth Client library.
  • FIPS 140-2 compatibility enforcement with the MailBee.Global.FipsMode property.
  • DKIM signing with strong SHA256 signatures.
  • Autodetection of SSL now works for and (in addition to Gmail, Yahoo, etc).
  • Preserve international characters in x-sender and x-receiver if they are present in email addresses.
  • IMAP CHILDREN support makes it easier to work with a large number of nested folders.
  • Parse standalone...

Released: Nov 27, 2013

Updates in this release

Updates in 8

  • Email Address Validator Component - Check email addresses for syntax and validity.
  • Support for mail merge over System.Data.IDataReader.
  • Support for OAuth v2.0 including Gmail's XOAUTH2 extension.
  • Improved IPv6 compatibility.
  • Improved support for Outlook .MSG and .PST conversions.
  • Improved MIME parser and builder, including support for international characters and quoted strings in headers.

Released: Jan 15, 2013

Updates in this release

Updates in 7.3

  • Windows 8 compatible installer.
  • New options for checking SSL certificates
  • .NET Framework 4.0/4.5 compatibility enhancements.
  • MIME parser fixes.