Blat won't work after email provider change

"[email protected] [blat]" <[email protected]>
Newsgroups gmane.mail.blat
Message-ID <[email protected]>
Hi, I'm hoping someone can help me... I set up Blat at my client's over 3 years ago (in 2012), and it's been working fine until a couple of days ago when they abruptly changed email providers (without notifying me!). I tried putting in the new server address / port but it fails. I then tried it on my own system, where I tested it before I originally installed it at my client's and it also fails! I tried playing with the port, another server address (smtp.broadband.rogers.com), IMAP instead of SMTP (couldn't get Blat to accept it) but to no avail. Here's what I get:
 

 X:\full>blat.exe - -debug  -subject "Testing blat" -body "testing blat (body)" -
 to "[email protected]" -f "[email protected]" -server "smtp.mtth.phub.net.cable.ro
 gers.com" -port 587 -u "[email protected]" -pw "xxxxxxxxxxxxxx"
 Blat v3.2.10 (build : Oct 20 2015 08:58:17)
 32-bit Windows, Full, Unicode
 

 <<<getline<<< 220 smtp.broadband.rogers.com ESMTP ready
 >>>putline>>> EHLO yb-hp-envy-15
 <<<getline<<< 250-smtp.broadband.rogers.com
 <<<getline<<< 250-PIPELINING
 <<<getline<<< 250-SIZE 41697280
 <<<getline<<< 250-8 BITMIME
 <<<getline<<< 250 STARTTLS
 Sending stdin.txt to [email protected]
 Subject: Testing blat
 Login name is [email protected]
 >>>putline>>> AUTH LOGIN
 <<<getline<<< 530 5.7.0 Must issue a STARTTLS command first
 *** Warning ***  The SMTP server does not require AUTH LOGIN.
 *** Warning ***  Are you sure server supports AUTH?
 >>>putline>>> MAIL FROM:<[email protected]>
 <<<getline<<< 530 5.7.1 Authentication required
 *** Error ***  The SMTP server does not like the sender name.
 *** Error ***  Have you set your mail address correctly?
 >>>putline>>> QUIT
 
 <<<getline<<< 221 2.0.0 Bye
 

 It's pretty much the same at my client's but with their credentials. What is STARTTLS - is this something that must now be run in addition to Blat, and if so, how do I do that?
 

 Thanks in advance,
 Yoram
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