add documentation for custom send_mail method
add documentation for custom send_mail method

zerolab/wagtail,mikedingjan/wagtail,nimasmi/wagtail,torchbox/wagtail,nealtodd/wagtail,wagtail/wagtail,zerolab/wagtail,rsalmaso/wagtail,gasman/wagtail,FlipperPA/wagtail,mikedingjan/wagtail,timorieber/wagtail,nealtodd/wagtail,zerolab/wagtail,kaedroho/wagtail,kaedroho/wagtail,mixxorz/wagtail,wagtail/wagtail,mikedingjan/wagtail,mixxorz/wagtail,rsalmaso/wagtail,takeflight/wagtail,mixxorz/wagtail,FlipperPA/wagtail,kaedroho/wagtail,thenewguy/wagtail,gasman/wagtail,zerolab/wagtail,wagtail/wagtail,kaedroho/wagtail,gasman/wagtail,gasman/wagtail,nimasmi/wagtail,takeflight/wagtail,thenewguy/wagtail,timorieber/wagtail,torchbox/wagtail,timorieber/wagtail,thenewguy/wagtail,rsalmaso/wagtail,mixxorz/wagtail,mikedingjan/wagtail,wagtail/wagtail,takeflight/wagtail,gasman/wagtail,torchbox/wagtail,jnns/wagtail,torchbox/wagtail,jnns/wagtail,rsalmaso/wagtail,nealtodd/wagtail,takeflight/wagtail,nimasmi/wagtail,jnns/wagtail,wagtail/wagtail,timorieber/wagtail,FlipperPA/wagtail,kaedroho/wagtail,mixxorz/wagtail,thenewguy/wagtail,nimasmi/wagtail,zerolab/wagtail,jnns/wagtail,FlipperPA/wagtail,thenewguy/wagtail,nealtodd/wagtail,rsalmaso/wagtail