Update mailer docker image
Update mailer docker image

Reduce size from 218MB to 142MB

n7consulting/Incipio,M-GaTE/Jeyser,N7-Consulting/Incipio,N7-Consulting/Incipio,N7-Consulting/Incipio,M-GaTE/Jeyser,N7-Consulting/Incipio,M-GaTE/Jeyser,n7consulting/Incipio,M-GaTE/Jeyser,n7consulting/Incipio