Why is Gmail incorrectly marking emails as bounced due to mailbox quota being full?

Email marketer from Hubspot explains that a full mailbox can lead to a soft bounce. They say to try resending the email. If the issue persists, clean your email list by removing those that repeatedly bounce to preserve your sending reputation.

Email marketer from MailerLite explains that a full mailbox can cause soft bounces. While it might be a temporary issue, repeated bounces from the same address should be removed from the mailing list.

Email marketer from Neil Patel explains that a high bounce rate can occur when Gmail servers are too busy to accept the email. The recipient's inbox may be full, but there are other reasons such as the server not being able to connect, the email being too large, or the recipient server may be down.

Email marketer from Stack Overflow explains that a 'mailbox full' error can sometimes appear if the email address is incorrectly formatted or if there's a typo. The receiving server might interpret the address as valid but non-existent, leading to this bounce message.

Email marketer from Reddit explains that they have seen bounces to both Gmail and iCloud accounts due to full mailbox issues. They found that the bounces happen more when users sign up for promotional offers, but then let the account become idle, reaching capacity.

Email marketer from DigitalMarketer explains that soft bounces are temporary issues. These can be caused by issues such as 'mailbox full', server downtime, or if the email is too large. They recommend trying again later or reducing the size of the email.

Email marketer from Sendinblue explains that a 'mailbox full' error means the recipient's inbox has reached its storage limit and cannot accept new emails. This is a soft bounce, and you can try resending the email later.

Expert from Email Geeks explains that there’s nothing incorrect with a ‘mailbox full’ bounce. The mailbox is full, it can’t accept mail.

Expert from Email Geeks explains that Gmail has given incorrect responses in the past and asks for the timeframe of the issue. He suggests the opens could have been Gmail opening the email, and asks if the users were also clicking.

Expert from Email Geeks explains that a "Gmail cleanup" is a theoretical event where Gmail makes a change impacting mailboxes, whether time-based, tightening requirements, or eliminating mailboxes they deem not valuable.

Expert from Spamresource explains that Mailbox full is a common reason for getting bounce backs from ISP's

Expert from Word to the Wise explains that a 'mailbox full' bounce can sometimes be caused by aggressive greylisting implementations. Some systems, when faced with a full mailbox during the initial greylisting attempt, may incorrectly interpret the temporary failure as a permanent full mailbox issue.

Documentation from Microsoft explains that a non-delivery report (NDR) indicating 'mailbox full' means the recipient's mailbox has exceeded its storage limit. The server is unable to accept any more emails until the recipient deletes some emails or increases the mailbox quota.

Documentation from RFC Editor explains that SMTP defines specific codes for delivery status notifications. A 'mailbox full' error typically corresponds to a 4.2.2 or 5.2.2 error code, indicating temporary or permanent mailbox capacity issues respectively.

Documentation from IETF explains that standardized bounce message formats include information about the cause of the delivery failure. A 'quota exceeded' or 'mailbox full' message will be included in the diagnostic code, along with other details about the system and the reason.

Documentation from Google explains that Google Workspace categorizes bounces as either soft or hard. A soft bounce might be due to a full mailbox, while a hard bounce indicates a permanent reason for failure. If an email address has too many hard bounces it might be removed from the list.