| Constant Contact | |
|---|---|
| Their stated threshold | Constant Contact does not publish a single numeric ceiling and their support guidance treats bounce rates above a few percent as a list quality problem to address. |
| What happens if you cross it | Their compliance team reviews accounts with poor list quality and will ask about the source of your contacts. They are more likely to guide than to suspend without warning, which is a real difference from Mailchimp. |
| Where the bounce data lives | Reporting, then the campaign, then the Bounces detail, which breaks the total into their named categories. Contacts, then the Non-existent segment, shows who was removed. |
| How bounces are classified | Bounces are labeled Non-existent address, Mailbox full, Vacation reply, Blocked, Suspended and Other. Only the non-existent category removes the contact automatically; the rest are informational. |
Bringing the rate down
Each step is an action inside Constant Contact, in the order worth taking them.
Read the bounce categories rather than the total
A high total driven by Mailbox full is a very different problem from one driven by Non-existent address. The category breakdown is the diagnosis and it is one click into the report.
Deal with the non-existent addresses first
These are the ones damaging your reputation. Constant Contact removes them, and the count tells you how much of your list was never real.
Investigate Blocked separately
Blocked means a receiving server refused your mail, which is a reputation or authentication problem on your side rather than a bad address. Cleaning the list will not touch it.
Check where the non-existent addresses came from
Constant Contact keeps the list membership, so grouping removals by list points at the import or signup form responsible.
Turn on your own signup form's confirmation step
It reduces the typo problem at source, which is where most non-existent addresses in a small business list come from.
The mistake people make here
A bounce report mixes two causes that need opposite responses: addresses that do not exist, and receivers refusing mail they could have delivered. The first is fixed by checking the list. The second is a sending problem and no amount of cleaning will move it.
Questions people ask
What do Constant Contact's bounce categories mean?
Non-existent address means the mailbox does not exist and the contact is removed. Mailbox full and Vacation reply are temporary. Blocked means a server refused your mail for a reason on your side. Suspended means the account exists but is inactive.
Does Constant Contact remove bounced contacts automatically?
It removes non-existent addresses. The other categories stay on your list, which is right, because a full mailbox may clear tomorrow.
What causes a Blocked bounce?
The receiving server refused your message, usually over reputation, authentication or a blocklist. It is a sending problem rather than a list problem and list cleaning will not fix it.