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My CiviMail sends fine--except to me for testing. I believe that is because all our mail goes through a spamguard service--mailprotector.net and the VERP address is choking it. Is there a way to turn off the VERP so I can verify this is the problem?

Here's what I see in the mail log for a failed/dropped send (changed domain name to mydomain.com):

May 10 10:31:45 WEBAPPS sendmail[11737]: q4AEVjE6011737: Authentication-Warning: webapps.mydomain.com: www-data set sender to b.44.104.7f3250c4639c8d1c@mydomain.com using -f
May 10 10:31:45 WEBAPPS sendmail[11737]: q4AEVjE6011737: from=b.44.104.7f3250c4639c8d1c@mydomain.com, size=2561, class=0, nrcpts=1, msgid=<201205101431.q4AEVjE6011737@webapps.mydomain.com>, relay=www-data@localhost
May 10 10:31:45 WEBAPPS sm-mta[11738]: q4AEVjuI011738: from=<b.44.104.7f3250c4639c8d1c@mydomain.com>, size=2815, class=0, nrcpts=1, msgid=<201205101431.q4AEVjE6011737@webapps.mydomain.com>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1]
May 10 10:31:45 WEBAPPS sendmail[11737]: q4AEVjE6011737: to="Mr. David Atkins Jr." <datkins@mydomain.com>, ctladdr=b.44.104.7f3250c4639c8d1c@mydomain.com (33/33), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=32561, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (q4AEVjuI011738 Message accepted for delivery)
May 10 10:31:46 WEBAPPS sm-mta[11740]: STARTTLS=client, relay=mydomain.com.inbound10.mailprotector.net., version=TLSv1/SSLv3, verify=FAIL, cipher=DHE-RSA-AES256-SHA, bits=256/256
May 10 10:31:46 WEBAPPS sm-mta[11740]: q4AEVjuI011738: to=<datkins@mydomain.com>, delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=122815, relay=mydomain.com.inbound10.mailprotector.net. [66.45.16.69], dsn=5.0.0, stat=Service unavailable
May 10 10:31:46 WEBAPPS sm-mta[11740]: q4AEVjuI011738: q4AEVkuI011740: DSN: Service unavailable
May 10 10:31:46 WEBAPPS sm-mta[11740]: q4AEVkuI011740: to=<b.44.104.7f3250c4639c8d1c@mydomain.com>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=30000, relay=mydomain.com.inbound10.mailprotector.net., dsn=5.7.1, stat=User unknown

thanks, I found a workaround

The issue here is bounce processing. So if your server (Microsoft Exchange, for example) is not going to able to handle VERP anyway, then you should set up a gmail account or something to handle bounce processing. With that mail server account configured, the VERP is applied to the gmail domain and does not choke the spam protector. This is probably only helpful for me to know, but here it is in case someone else can benefit...

to, to summarize

to: datkins@mydomain.com
mail is then sent via sendmail -f "b.53.113.d9231d159614cd9d@gmail.com" -> Return-Path: b.53.113.d9231d159614cd9d@gmail.com
and appears to come from: datkins@mydomain.com

now...whether the bounce processing actually works or not...that's probably another problem due to the sendmail method...

I cannot find this prefix setting...I see a setting for VERP separator at /civicrm/admin/mail but where is the prefix configured? Is this "localpart" in the mail account setting?
/civicrm/admin/mailSettings?action=update&id=3&reset=1

should I set localpart to example+

is the VERP separator ok as "." still?

thanks, I found a workaround

The issue here is bounce processing. So if your server (Microsoft Exchange, for example) is not going to able to handle VERP anyway, then you should set up a gmail account or something to handle bounce processing. With that mail server account configured, the VERP is applied to the gmail domain and does not choke the spam protector. This is probably only helpful for me to know, but here it is in case someone else can benefit...

to, to summarize

to: datkins@mydomain.com
mail is then sent via sendmail -f "b.53.113.d9231d159614cd9d@gmail.com" -> Return-Path: b.53.113.d9231d159614cd9d@gmail.com
and appears to come from: datkins@mydomain.com

now...whether the bounce processing actually works or not...that's probably another problem due to the sendmail method...

Could you help me to setup the catch-all profile?
I have an account chc.bouncemail@gmail.com

My Joomla is hosted by an ISP.
In CiviCRM  > Mail Accounts I set

Name GMail
Server pop.gmail.com:995   
Username   chc.bouncemail
Password   Password to use when polling (for IMAP and POP3).
Localpart   chc.bouncemail+
Email Domain gmail.com
Return-Path   chc.bouncemail@gmail.com
Protocol pop3
Source   
Use SSL?   yes
Used For? bounce processing   

But CiviCRM does not report any bounce for wrong addresses, and I do not receive any return message from gmail.
Thank you.