Sorry for my previous comment from day before, at first I thought the problem was with triggers really. I'm really sorry for inconveniences caused.

Does this only happen if you leave off the suffix? I tried with a few of my email addresses and they worked just fine. What version of Jenkins and email-ext?

No, it happens with explicit suffixing too, I tried that. I didn't try only bcc:"master.maker$suffix" .
Regarding versions, it's only at Monday that I'll be able to post jenkins version and debug output from plugin

Plugin version is 2.40.2, I'm pretty confident with it.

What I should also mention, the mail server is Microsoft Exchange and I am sending mails through the DavMail gate on my machine. But according to debug output I saw the invalid recipient list is composed before even connecting to SMTP.

Can you enable debug mode in the global config for email-ext and attach the build log? (Make sure to remove anything that is sensitive).

Already did it, I'll attach the build log tomorrow when I'm at work again

Attached build log (names masked)

Everything looks ok in the log. Which users from the list didn't receive the email?

At least BCC became CC

I'll attach another log without quotes shortly.

Does your mail server support bcc? I sent to addresses with dots in cc and bcc to gmail with no problems. I even put quotes around some addresses like you have.

Just sent mail to myself and BCC'd to colleague through Outlook
He got it and does not see himself as a recipient

Anyways, I see Ext plugin adds it as explicit RCPT, this should not happen if the person is BCC'd, does it?

I meant DavMail, not Outlook. See "How SMTP actually works" on http://stackoverflow.com/questions/2750211/sending-bcc-emails-using-a-smtp-server. Based on that, you would still see the BCC person as a RCPT entry with the mailserver.

Ok, I'll go take a look at DavMail source. Don't close this issue, I'll update it with non-quoted version soon

I won't close until resolved.

This actually has nothing to do with dots in the email address. It has to do with a bug I introduced that parsed the cc and bcc stuff incorrectly. I was not seeing it on the code I was using because I had already fixed it. I should have run earlier with the released version of the code. Should have a fix in the next version.

Code changed in jenkins
User: Alex Earl
Path:
src/main/java/hudson/plugins/emailext/EmailRecipientUtils.java
http://jenkins-ci.org/commit/email-ext-plugin/cea631c421b7964ba710d21c3a4131d7a881f739
Log:
Fix JENKINS-28444

Fix incorrect check for > 0 size on the bcc an cc lists.

Oh!
Very sorry for not providing logs.
Suddenly got very sick.

Thanks for sorting this out anyways!