Hello, I'm using version 1.5 m1. While trying to register an user I'm getting error 553 - my smtp requires authenticating even from 127.0.0.1. Don't ask :/ I have a pretty good idea how to modify MailSenderPlugin to authenticate, but here's a surprise - it's not used. At least not when sending welcome mails. com.xpn.xwiki.XWikiException: Error number 10006 in 10: Could not send mail to s erver 127.0.0.1 port 25 error code 553 (553 sorry, that domain isn't in my list of allowed rcpthosts / Ta domena nie znajduje sie na liscie obslugiwanych przez serwer, jest zablokowana lub nieprawidlowo skonfigurowano uwierzytelnianie SMTP (#5.5.3 - vuser) ) at com.xpn.xwiki.XWiki.sendMessage(XWiki.java:3258) at com.xpn.xwiki.XWiki.sendMessage(XWiki.java:3294) at com.xpn.xwiki.XWiki.sendValidationEmail(XWiki.java:3199) at com.xpn.xwiki.XWiki.sendValidationEmail(XWiki.java:3162) at com.xpn.xwiki.XWiki.createUser(XWiki.java:3114) at com.xpn.xwiki.web.RegisterAction.action(RegisterAction.java:41) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:216) at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:116) at org.apache.struts.action.RequestProcessor.processActionPerform(Reques tProcessor.java:431) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.ja va:236) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:119 6) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) at javax.servlet.http.HttpServlet.service(HttpServlet.java:709) It seems XWiki.sendMessage is deprecated, true, but still in use. Are there any plans to actually connect MailSenderPlugin any time soon? Adding authing in MailSenderPlugin would be trivial. Hacking it into current version of XWiki.sendMessage, well, that'd be less trivial. Any suggestions on what to do? I need it more or less working in about two weeks. Greetings, Lilianne E. Blaze