Update SMTP instructions
Update SMTP instructions

Needs dev review.
lawrenae/mattermost,florianorben/platform,daizenberg/platform,npcode/platform,cadecairos/mattermoz,rgarmsen2295/platform,bkeroack/platform,rompic/platform,dotcominternet/platform,xogeny/platform,mozilla/mattermoz,raghavenc5/TabGen,cyanlime/platform,StateFarmIns/mattermost,dimitertodorov/platform,rahulltkr/platform,numericube/platform,ninja-/platform,xogeny/platform,xogeny/platform,ZBoxApp/platform,numericube/platform,lawrenae/mattermost,asaadmahmoodspin/platform,florianorben/platform,rahulltkr/platform,ninja-/platform,rompic/platform,npcode/platform,florianorben/platform,lawrenae/mattermost,tbolon/platform,kernicPanel/platform,dotcominternet/platform,trashcan/platform,npcode/platform,xogeny/platform,bkeroack/platform,andela/mattermost-platform,raghavenc5/TabGen,samogot/platform,42wim/platform,raghavenc5/TabGen,raghavenc5/TabGen,ZBoxApp/platform,rahulltkr/platform,trashcan/platform,daizenberg/platform,42wim/platform,apaatsio/platform,rahulltkr/platform,dotcominternet/platform,apaatsio/platform,ZBoxApp/platform,apaatsio/platform,ttyniwa/platform,mozilla/mattermoz,daizenberg/platform,ninja-/platform,trashcan/platform,StateFarmIns/mattermost,asaadmahmoodspin/platform,mozilla/mattermoz,kernicPanel/platform,ninja-/platform,samogot/platform,StateFarmIns/mattermost,ttyniwa/platform,42wim/platform,xogeny/platform,andela/mattermost-platform,kernicPanel/platform,ZBoxApp/platform,kernicPanel/platform,florianorben/platform,cadecairos/mattermoz,asaadmahmoodspin/platform,rgarmsen2295/platform,ttyniwa/platform,rgarmsen2295/platform,fosstp/platform,cadecairos/mattermoz,apaatsio/platform,cyanlime/platform,StateFarmIns/mattermost,andela/mattermost-platform,rompic/platform,andela/mattermost-platform,tbolon/platform,ttyniwa/platform,dotcominternet/platform,andela/mattermost-platform,tbolon/platform,bkeroack/platform,tbalthazar/platform,mozilla/mattermoz,trashcan/platform,tbalthazar/platform,rgarmsen2295/platform,numericube/platform,lawrenae/mattermost,fosstp/platform,cyanlime/platform,tbolon/platform,npcode/platform,lawrenae/mattermost,fosstp/platform,cyanlime/platform,tbalthazar/platform,npcode/platform,ZBoxApp/platform,kernicPanel/platform,florianorben/platform,trashcan/platform,rgarmsen2295/platform,bkeroack/platform,StateFarmIns/mattermost,dimitertodorov/platform,tbolon/platform,bkeroack/platform,raghavenc5/TabGen,cadecairos/mattermoz,ninja-/platform,ttyniwa/platform,mozilla/mattermoz,apaatsio/platform,dimitertodorov/platform,fosstp/platform,samogot/platform,cadecairos/mattermoz