How to verify a terra.com.br email address

The reply that matters is the one to RCPT TO, the step where the checking server names the recipient. Terra Mail answered our made-up terra.com.br address with 550 5.7.0 recipient rejected. A 5xx code at that step is a permanent "no such mailbox", which is the same answer a real message would get, so SimpleVerifier marks the address invalid with the reason "Mailbox not found". A 250 at the same step means the mailbox exists and comes back valid.

Before trusting a "valid", a careful verifier also offers a random address that cannot exist. Terra Mail rejected ours, so terra.com.br is not a catch-all: a 250 for your address is a real signal. Temporary 4xx replies (421, 450, 451) are about the connection, not the mailbox, and come back risky with "Server would not confirm" rather than invalid. Hard bounce vs soft bounce explains why that split matters.

Terra uses the policy-class code 5.7.0 rather than 5.1.1, but it rejected a made-up recipient at RCPT TO while the same server accepted the sender, so the checker returns it as a missing mailbox.

The Terra Mail conditions are a contract between Terra Networks Brasil S.A. and a subscriber, not a free-mail promise. Clause 2.9.1 says that once the service is cancelled for any reason, the mailbox contents are removed from Terra's servers straight away and nobody can recover them.

That means an @terra.com.br address can stop working after a subscriber leaves, and the same page says a username already chosen by one subscriber can't be chosen by another. We have no probe observation for this domain, so we don't say how its servers answer a mailbox check. Re-confirm older Terra contacts and suppress any that bounce permanently.

Because Terra Mail answers honestly, terra.com.br is one of the domains where verification removes bounces before they happen. Drop the invalid results, keep the valid ones, and re-check the risky ones later: a temporary reply on one day often turns into a clear answer the next.

A valid result only means the mailbox exists today. Addresses on an old consumer list go stale as people stop using them, so re-verify before each large send to an aged segment; how often to verify an email list gives a schedule. Upload the CSV to the verifier and download the valid, risky and invalid rows as separate files.