[cobalt-developers] Firewall says: Unusual System Events using -f

["SarrCom.com" <nospam@xxxxxxxxxxx>]

Hi,
We installed a firewall on our RaQ 550 and it sends me "Unusual System Events" occasionally and sometimes it says:

Unusual System Events
=-=-=-=-=-=-=-=-=-=-=
Apr  9 19:37:00 cob2 sendmail[29182]: h39Hb0F29182: Authentication-Warning: cob2.***.com: httpd set sender to lomail@elgische***.com using -f
Apr  9 19:37:00 cob2 sendmail[29188]: h39Hb0G29188: Authentication-Warning: cob2.***.com: httpd set sender to lomail@elgische***.com using -f
Apr  9 19:37:00 cob2 sendmail[29192]: h39Hb0o29192: Authentication-Warning: cob2.***.com: httpd set sender to lomail@elgische***.com using -f
Apr  9 19:37:00 cob2 sendmail[29195]: h39Hb0P29195: Authentication-Warning: cob2.***.com: httpd set sender to lomail@elgische***.com using -f
Apr  9 19:37:00 cob2 sendmail[29201]: h39Hb0f29201: Authentication-Warning: cob2.***.com: httpd set sender to lomail@elgische***.com using -f
Apr  9 19:37:00 cob2 sendmail[29206]: h39Hb0A29206: Authentication-Warning: cob2.***.com: httpd set sender to lomail@elgische***.com using -f
Apr  9 19:37:01 cob2 sendmail[29209]: h39Hb0f29209........        (email addresses changed)

I'm not a programmer but AFAICT using -f means we added an extra parameter '-f' as the from field in the newsletter script to route bounced messages to the from address instead of the server admin. FYI: the newsletter is sent by the PHP mail() command twice a week.

Any suggestions on how to avoid those Unusual system events messages? Since the newsletter is quite large, the Unusual system events message is large too, > 1 MB... Or just ignore them?
Tks+Brgds,
Reginald