Empty mailbox
Overview Whenever a user exceeds his or her storage, an e-mail client may report zero e-mails present despite there actually...
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Handling a hijacked account
Overview This is a general document on what happens when an account is compromised, how it is compromised, and policies... -
How to fix SPF issues when emailing Google hosted or @gmail domains.
This issue isn’t specific to Google as a recipient but it is one of the most common pain points with... -
Improving mail filter performance
Overview E-mail that flows into the server goes through several phases of filtering before final delivery, including: DNSBL lookups on... -
Mail filtering
Overview Message filtering is done prior to delivery via maildrop. Each message goes through two levels of filters: (1) global... -
Mail forwarded to GMail is delayed
Overview When creating a forwarded email to deliver mail to third-party providers, such as GMail and Live, mail delivery may... -
Mail sent to a hosted domain does not arrive if third-party MX records are present
Overview Mail sent to a domain hosted by your account that uses third-party MX records does not arrive to the... -
Mail sent via 127.0.0.1 rejects with “Relaying Denied”
Overview Email that is sent over TCP via 127.0.0.1 or the server IP address is rejected with a “521: Relaying... -
Migrating mail from elsewhere
Overview When migrating from a previous hosting provider or even consolidating user accounts, it may be necessary to incorporate email... -
POP3 vs IMAP e-mail protocols
Overview POP3 and IMAP are two separate protocols to access e-mail stored on the server. POP3 originated first in 1996...
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