Consistently sending emails to 'over quota' addresses negatively impacts sender reputation. Gmail shares storage across its services, leading to such bounces when limits are reached. Experts recommend a multi-faceted approach including bounce management, immediate suppression of repeat offenders, list segmentation based on engagement, and strict list hygiene practices. RFC standards dictate these bounces should be treated as permanent failures. Ignoring 'over quota' bounces significantly harms deliverability and sender reputation.
10 marketer opinions
Consistently sending emails to 'over quota' addresses negatively impacts sender reputation. Experts recommend implementing a bounce management strategy, segmenting lists based on engagement, and immediately suppressing users who trigger overquota bounces. Maintaining list hygiene and promptly addressing bounce messages are crucial for deliverability.
Marketer view
Email marketer from SendGrid explains that managing bounces, including 'over quota' bounces, is crucial for maintaining a good sender reputation. They recommend automatically removing recipients who consistently trigger bounces from your sending list.
16 Aug 2022 - SendGrid
Marketer view
Email marketer from OptinMonster recommends cleaning your email list regularly to improve deliverability. Overquota bounces are an indicator of low-quality addresses which should be removed.
18 Dec 2024 - OptinMonster
2 expert opinions
Experts emphasize that correctly processing bounces, including temporary failures like 'over quota' errors, is crucial for maintaining a good sender reputation. Good list hygiene practices, including monitoring and acting upon bounce metrics, are essential for effective email deliverability. Ignoring bounces negatively impacts sender reputation.
Expert view
Expert from Spamresource.com explains that having good list hygiene practices is critical to maintaining sender reputation. They explain that bounces are a critical metric for understanding list hygiene and must be actioned. Although not directly answering the question, overquota errors are bounces which must be managed effectively.
14 Aug 2021 - Spamresource.com
Expert view
Expert from Word to the Wise explains that bounces should be processed correctly, including temporary failures. While this article doesn't mention overquota specifically, understanding and acting upon temporary bounce codes which is what overquota is, is critical for maintaining a good sender reputation. Ignoring these impacts sender reputation.
9 Jan 2024 - Word to the Wise
4 technical articles
Gmail shares storage across Google Drive, Gmail, and Google Photos. When this limit is reached, 'over quota' bounces occur. RFC standards dictate 'over quota' errors should be treated as permanent failures. Sending to these addresses negatively impacts sender reputation and deliverability on platforms like AWS SES and Microsoft. Removing such addresses is advised.
Technical article
Documentation from Microsoft states that mailbox full issues will result in a non-delivery report which impacts your sender reputation. It suggests removing email addresses which result in bounces.
11 Feb 2023 - Microsoft
Technical article
Documentation from AWS SES explains that when a recipient's mailbox is full ('over quota'), it results in a bounce. Repeatedly sending to these addresses negatively impacts your sender reputation and deliverability.
5 Jun 2025 - Amazon Web Services
Can a hard bounced email address become deliverable again, and under what circumstances?
Do soft bounces affect email deliverability and sender reputation?
How are email bounce rates calculated and what is considered a good bounce rate?
How do Gmail 'mailbox full' bounces affect email deliverability and how can I monitor it?
How should email marketers handle 452 mailbox full bounce codes, especially from Gmail, during email warmup?
How should email marketers handle Gmail addresses with overquota inboxes?
How should email marketers handle permanent bounce errors like full or inactive mailboxes?