Mick <michaelkintz...@gmail.com> writes: > -----The following addresses had permanent fatal errors----- > <email_acco...@isp.com> > (reason: 550 5.1.0 <nag...@myserver.mydomain.com> sender rejected : invalid > sender domain) > > -----Transcript of session follows ----- > ... while talking to smtp.ISP.com: >>>> MAIL From:<nag...@myserver.mydomain.com> SIZE=745 AUTH=<> > <<< 550 5.1.0 <nag...@myserver.mydomain.com> sender rejected : invalid sender > domain > 554 5.0.0 Service unavailable > ================================================================ > > Does this fail because the ISP's reverse DNS on my dynamically allocated IP > address resolves to an ISP domain instead of myserver.mydomain.com? > > Is there something I could change in the configuration of my server to make > this work again?
I think you might avoid the problem by making sendmail Impersonate your isps domain. Using some or all of these settings in sendmail.mc MASQUERADE_AS(`yourISP.domain')dnl MASQUERADE_DOMAIN(`youractual.domain')dnl FEATURE(masquerade_entire_domain)dnl FEATURE(masquerade_envelope)dnl
