Mailbox provider · Cogeco email
How to verify a cogeco.ca email address
Can you verify @cogeco.ca addresses?
YesYes. @cogeco.ca answers mailbox checks one address at a time.
Check one address
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The checker opens an SMTP conversation with cogeco.ca's mail server, offers a random address first to rule out a catch-all, then names your address at RCPT TO and disconnects without sending. A rejection comes back invalid ("Mailbox not found") and an acceptance valid ("Mailbox exists"). Temporary replies come back risky. It always checks the syntax, the domain's MX records, disposable domains and role addresses such as info@ first.
Mailbox existsMailbox not foundServer would not confirmCogeco email addresses can be verified without sending an email. On 4 November 2026 the cogeco.ca mail server mx.cogeco.ca rejected a made-up recipient at the SMTP RCPT TO step with 550 5.1.1 [R2] Recipient …@cogeco.ca does not exist here., so a mailbox check can tell a missing cogeco.ca account from a real one.
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Live DNS snapshot: cogeco.ca
Checked 5 November 2026, 03:29 UTCRead from DNS at the time shown and refreshed at most once a day. MX says where mail for cogeco.ca goes; SPF and DMARC describe mail sent from it, not whether any one address exists.
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mx.cogeco.ca - 20
mx.cogeco.net
v=spf1 a:metaswitch.cgocable.ca a:smtp.cogeco.ca mx:cogeco.ca mx:cogeco.net mx:cgocable.ca include:_ip.cogeco.ca include:aspmx.pardot.com include:_spf.cogeco.syn-alias.com include:cust-spf.exacttarget.com ip4:142.67.126.77 ip4:142.67.126.76 ~allp=reject: meets the requirement and enforces it.
v=DMARC1;p=reject;rua=mailto:abuse@cogeco.ca;ruf=mailto:abuse@cogeco.ca;Look up any other domain with the MX lookup or the email provider lookup.
Cogeco email at a glance
| Operated by | Cogeco Connexion, CanadaSource: Cogeco support: dormant email accounts |
|---|---|
| MX hosts | mx.cogeco.ca, mx.cogeco.netObserved 4 November 2026 (dig MX) |
| Answer to a made-up address | 550 5.1.1 [R2] Recipient …@cogeco.ca does not exist here., returned at RCPT TOObserved 4 November 2026 (SMTP probe of a made-up recipient, no message sent) |
| Inactive accounts | A residential email address not accessed for 8 months is classified as dormant; business accounts don't become dormantSource: Cogeco support: dormant email accounts |
| Inactive accounts | After 12 months of consecutive non-usage, a dormant account may be permanently deleted without noticeSource: Cogeco support: dormant email accounts |
What Cogeco email's server says about a missing mailbox
The reply that matters is the one to RCPT TO, the step where the checking server names the recipient. Cogeco email answered our made-up cogeco.ca address with 550 5.1.1 [R2] Recipient …@cogeco.ca does not exist here.. 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. Cogeco email rejected ours, so cogeco.ca 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.
Cogeco marks addresses dormant after 8 months
Cogeco's support article says a residential address that isn't accessed for 8 months is classified as dormant, and that after 12 months of consecutive non-usage a dormant account may be permanently deleted without notice. Business accounts are not affected.
That means a cogeco.ca address from a list more than a year old may be gone even if the person is still a Cogeco customer. The server rejects unknown users at RCPT TO, so re-check old segments shortly before you mail them and suppress the ones that come back invalid.
Cleaning cogeco.ca addresses on a list
Because Cogeco email answers honestly, cogeco.ca 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.
Common questions
- Can you verify @cogeco.ca addresses?
- Yes. @cogeco.ca answers mailbox checks one address at a time. The checker opens an SMTP conversation with cogeco.ca's mail server, offers a random address first to rule out a catch-all, then names your address at RCPT TO and disconnects without sending. A rejection comes back invalid ("Mailbox not found") and an acceptance valid ("Mailbox exists"). Temporary replies come back risky. It always checks the syntax, the domain's MX records, disposable domains and role addresses such as info@ first.
- Can I check if a cogeco.ca address exists without emailing it?
- Yes. A verifier connects to Cogeco email's mail server, names the address at the RCPT TO step and disconnects before sending. On 4 November 2026 the server rejected a made-up cogeco.ca address with "550 5.1.1 [R2] Recipient …@cogeco.ca does not exist here.", so a missing mailbox shows up as invalid and the owner receives nothing.
- What mail servers does cogeco.ca use?
- On 4 November 2026, cogeco.ca published these MX hosts: mx.cogeco.ca, mx.cogeco.net. You can look them up yourself with the free MX lookup tool.
- Why did a cogeco.ca address come back risky instead of invalid?
- Risky means the server didn't give a permanent answer during the check, usually a temporary 4xx reply or a timeout. It isn't proof the address is bad. Check it again later; Cogeco email gave a clear rejection for a missing mailbox when we tested it.
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