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Mail Flow Topology

It is important to understand the entire mail flow from sender to receiver. It helps to understand the entire mechanics and workings of all the several components that exists in the mail flow topology. The understanding of this will help you to troubleshoot why some email cannot be send or why you cannot receive certain emails. A - User compose a  email using Mail Client. The email is sent from mail client to mail server via SMTP, MAPI or ActiveSync. The Mailbox maintain constant connectivity B - Mail Server check for outgoing mail security rules/policies C - If YES, then check for Internal Mailbox D - Deliver to Mailboxes E - If uncached or new MX Domain record, then query MX from DNS Server F - Sender Mail to Receiver Mail Server via SMTP (25, 2525) or SMTPS (465) or SMTP/TLS (587) G - Received Mail Server check SPF records H - Mail Server check for incoming mail security rules/policies I - Mail Server check for valid user mailbox J - Mail Server deliver to User mailbox

How to have the Best Video Conference Meeting Experience?

Better Video/Audio  Good WebCam -  Logitech FHD WebCam , Microsoft LifeCam, Razer Kiyo Good Microphone - Blue Yeti, Samson Go, Razer   Good Headset -  Logitech ,  Plantronics ,  Jabra Good Speakerphone - Jabra , Logitech , Poly (Plantronics) , Yealink Better Position Realign eye level to webcam Better Lighting  Avoid any light source like windows or lamp behind you Observe 3 point Lighting Enable FHD  In Zoom https://support.zoom.us/hc/en-us/articles/207347086-Group-HD Need Business, Enterprise and Education (Pro version can support HD 720p only) Run on i7 processor notebook Enable Group HD Select Full HD (1080P) Need at least  Receiving (Download) 2.5 Mbps   Sending (Upload) 3Mbps  Check here https://www.speedtest.sg In Microsoft Teams Default is FHD 1080p IT Support, IT Company, IT Services Win-Pro Singapore IT Support, IT Company, IT Services Win-Pro Malaysia