Reply-To Is Not the Address That Receives the Original Message
Learn how Reply-To differs from the original message’s recipients, which fields and headers to inspect, and what to check when a message seems to be missing.
5 minute readTHE MAIL BLOG / POWERED BY BITTU ICLOUD
Mail delivery
Understand bounces, delays, authentication and the journey from Send to the inbox.
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Why You May Not See Yourself in the To or Cc Fields
Learn why your address may be absent from To and Cc, what Bcc and group delivery can hide, and how to confirm with the sender without assuming the message was not delivered.
5 minute readHow to Investigate Duplicate Copies of the Same Email
A practical method for comparing duplicate emails by sender, recipients, time, subject and Message-ID, then checking forwarding and filters before escalating.
5 minute readWhen Only One Recipient Reports That Your Email Is Missing
A practical way to investigate one missing email by comparing the message, checking the affected mailbox, and asking its provider for specific delivery details.
5 minute readWhy Messages Can Arrive Out of Order
Learn why closely timed emails may reach an inbox in a different order, which timestamps and headers to compare, and how to check whether a message is actually missing.
5 minute readThe Message Arrived, but Not in the Inbox: Where to Look
A step-by-step guide to finding a message outside your inbox, checking filters and quarantine where available, and confirming the sender used the right address and time.
5 minute readWhen a Recipient’s Quarantine Holds a Message
Learn why a message may be held outside the inbox, how recipients should check through approved channels, and what senders can—and cannot—infer from a quarantine notice.
5 minute readWhy Allowlisting a Sender May Not Fix Missing Mail
Learn why an allowlisted sender can still be blocked, where to look for the actual delivery reason, and when to involve your mail administrator.
5 minute readWhen the Recipient Has Blocked the Sender’s Address
Learn how a recipient-side email block can affect delivery, why it may not generate a clear bounce, and how to verify the situation respectfully.
5 minute readHow to Recognise a Forwarding Loop from Delivery Notices
Learn to spot repeated forwarding hops in delivery notices, distinguish a likely loop from other failures, and work with the right administrator to break the cycle.
5 minute readA Mail Alias Is Not Always a Separate Delivery Destination
Learn how aliases differ from mailboxes, how to find their configured destination, and what a bounce can—and cannot—tell you.
5 minute readWhy Plus-Addressed Mail May Be Rejected by a Recipient
A plus sign in an email address may be accepted, ignored, or rejected depending on the recipient’s mail service. Learn how to check the exact address and use delivery errors.
5 minute readFollow your curiosity.
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