Hosting email limits: mailbox storage, sending caps and deliverability are separate

Read plan/account quota before mailbox count

A plan may allow several mailboxes while all website/database/mail data shares one storage quota. Estimate retained mail volume and attachments per mailbox so total usage is understood.

Deleted mail can remain in Trash/Junk folders until clients or server retention purge it.

Understand message-size overhead

Email attachments are encoded and can consume more transmitted/stored bytes than the source file. Sender, receiver, and intermediate systems can have different message-size ceilings.

Use file-sharing or another workflow for very large files; continually increasing mail limits is not a durable fix.

Respect outbound abuse/reputation controls

Shared hosting mail is intended for site/business mailbox use within policy, not bulk marketing infrastructure. Sudden high volume, compromised scripts, or mailing-list behavior can trigger rate/reputation issues.

Use authenticated submission and keep SPF/DKIM/DMARC aligned for legitimate domain mail.

Archive or upgrade based on measured use

Track mailbox/account storage growth and clean retention intentionally. If mail is mission-critical or unusually large/complex, evaluate a dedicated mail service when web-hosting mail no longer fits the workload. Test an IMAP client and a real external send/receive path after quota or retention changes so a storage cleanup does not silently break normal mailbox use.

• Budget shared account storage.
• Account for message encoding/size limits.
• Follow anti-abuse sending policy.
• Monitor mailbox growth.