[Fix] Mailhog should be exposed to backend
[Fix] Mailhog should be exposed to backend

- fixes failing connection to host "mailhog" when sending mail via smtp
- mailhog needs to be available for the backend at Port 1025
- i.e. in a Laravel app .env should contain "MAIL_HOST=mailhog 
jfoliveira/laradock,springjk/laradock,macghriogair/laradock,cjnchk/laradock,hnquang112/laradock,ydatech/yii2-laradock,zuohuadong/laradock,NewbMiao/laradock,jfoliveira/laradock,AliveCorpse/laradock,hnquang112/laradock,vjekoslav/laradock,vjekoslav/laradock,AliveCorpse/laradock,kolobai/laradock,tharaxodia/laradock,Competa-IT/laradock,kolobai/laradock,NewbMiao/laradock,luciano-jr/laradock,olegl-hyuna/laradock,hnquang112/laradock,Harmonic/laradock,arkadiusjonczek/laradock,ydatech/yii2-laradock,Harmonic/laradock,Harmonic/laradock,a-h-abid/laradock,ancon/laradock,ralphowino/laradock,schiggi/laradock,zuohuadong/laradock,hp9390/laradock,springjk/laradock,arkadiusjonczek/laradock,zuohuadong/laradock,schiggi/laradock,ralphowino/laradock,bestlong/laradock,bestlong/laradock,luciano-jr/laradock,macghriogair/laradock,kolobai/laradock,jcharlesworth/laradock,emmac1016/laradock,emmac1016/laradock,bestlong/laradock,cjnchk/laradock,springjk/laradock,bestlong/laradock,arkadiusjonczek/laradock,Competa-IT/laradock,jinnawat/laradock,cjnchk/laradock,springjk/laradock,vjekoslav/laradock,olegl-hyuna/laradock,jinnawat/laradock,a-h-abid/laradock,bestlong/laradock,jinnawat/laradock,ralphowino/laradock,schiggi/laradock,ralphowino/laradock,jinnawat/laradock,LaraDock/laradock,hnquang112/laradock,arkadiusjonczek/laradock,cjnchk/laradock,NewbMiao/laradock,hp9390/laradock,Harmonic/laradock,ancon/laradock,tharaxodia/laradock,jcharlesworth/laradock,macghriogair/laradock,schiggi/laradock,zuohuadong/laradock