5.1

• replace javax.mail dependency with jakarta mail 1.6.4
• upgrade slf4j to 1.7.28
• add null check for slf4j setContextMap as per #13

5.0

• add option to set server name #7
• add MessageContext param to authentication methods #9 (breaking change)
• add custom success return on data command #10 (breaking change)
• disable stacktrace generation for RejectException #11

Thanks @peterjurkovic, @diegosalvi!

4.0.1

• no significant changes since last release, this is the first non-RC release as requested in #8

4.0-RC8

• fix internal naming in SMTPServer and remove redundant Precondition checks
• get Travis to build on OpenJDK8 as well
• enable TLS when requireTLS set #2
• if requireTls set then don't advertise auth from EHLO before tls started #3
• upgrade to javax.mail 1.6.1, add STARTTLS unit test with PLAIN auth #1

4.0-RC6

• add maxMessageSize checking to BasicMessageListener
• add error response test (can send next message after the DATA submission returned an error response)
• add MessageContext parameter to BasicMessageListener.messageArrived parameter

4.0-RC4

• add BasicMessageListener which is a SAM version of MessageHandler
• add SMTPServer builder support for BasicMessageListener

4.0-RC3

• add serverSocketFactory methods to SMTPServer to enable pure SSL SMTP
• add more precondition checks to SMTPServer
• rename SMTPServer.Builder.sslSocketCreator method to startTlsSocketCreator to distinguish from new serverSocketFactory method.

4.0-RC2

• move internal classes to internal packages so is clear what the public API is
• fix bug in Practice.main
• remove dead store from PlainAuthenticationHandlerFactory
• specify Charset (US_ASCII) for data content in WiserMessage
• SMTP AUTH decode should specify character set (UTF-8) for username and password
• make fields final
• fix imports
• add javadoc to SMTPServer and remove unnecessary sleeps after start() called in unit tests
• add Override annotations
• add EmailUtils tests
• add SmartClient coverage
• add client test with BasicSMTPServer
• move BasicSMTPServer to smtp package
• add BasicSMTPServerTest
• improve test coverage of TextUtils and throw IllegalArgumentException instead of IllegalStateException
• add Constants test
• don't prefix static field with this.
• use Optional in ReceivedHeaderStream`
• add SMTPServer javadoc
• use Optional in MessageContext, AuthenticationHandler, Session

4.0-RC1

• required Java 8 (just because of Base64 class at the moment, Java 7 required now because of use in unit test of X509TrustManager)
• converted SMTPServer to be largely immutable and is created with a builder pattern
• adjusted Wiser API to cope with an immutable SMTPServer
• disallowed inheritance of SMTPServer (now final)
• Wiser now created with builder pattern (disallowed inheritance and added accepter builder method)
• use composition instead of inheritance in SmartClient
• use static factory method for SmartClient so that references don't escape the constructor (connect was called from the constructor)
• use explicit character set with InputStreamReader (US_ASCII) in SMTPClient and SmartClient
• use java.util.Optional and Preconditions in SmartClient, SMTPClient and SMTPServer

3.9.1-RC2

• remove Mig Base64 because original code was complex and had no unit tests, moreover Java 8 Base64 is faster (and I'm happy to require Java 8)
• make stateless methods static
• add full unmocked StartTLS test
• improve coverage by chaining constructor in SMTPServer
• improve coverage of EmailUtils and remove unused method from EmailUtils
• cleanup - remove public from interface methods, set fields as private and final where appropriate
• improve test coverage a bit