Attachment limits: Gmail & Outlook
You hit attach — and your email bounces. Or it sends but the recipient's server rejects it. Attachment limits trip up professionals every day because every provider caps message size, and those caps are smaller than most decks, video snippets, or raw exports.
Here's how Gmail and Outlook handle limits in practice — and the workflow that always works for large files.
Gmail attachment limits
Gmail generally limits attachments to about 25 MB per message before it pushes you toward Google Drive. Exact behavior can vary slightly based on encoding — when you're close to the limit, Gmail may suggest uploading to Drive and inserting a link instead.If you're on Google Workspace, admins can enforce organizational policies — always check internal guidance if enterprise mail rejects unexpectedly.
Outlook / Microsoft limits
For Outlook.com and typical Microsoft 365 mailboxes, attachment caps often fall around 20–34 MB depending on account configuration — mailbox limits, transport rules, and recipient servers all matter. The weakest link wins: your email might accept a file your client's infrastructure rejects.Microsoft 365 commonly integrates OneDrive sharing links when files exceed comfortable attachment thresholds.
The reliable fix: cloud links
Instead of attaching multi-megabyte files directly:1. Upload to Google Drive, OneDrive, Dropbox, or your company's approved storage.
2. Generate a share link with appropriate permissions (view-only for externals unless editing is required).
3. Paste the link into the email body with one sentence of context: what's inside, why it matters, expiry if sensitive.
Links bypass most attachment filters, reduce inbox storage pressure, and let you revoke access later — attachments can't do that.
Professional etiquette
Name files clearly: Acme-Q3-Proposal-v3.pdf, not final_final_REALLY.pdf. Mention approximate size when sending huge downloads: "≈120 MB video walkthrough — Wi‑Fi recommended."Finding old attachments without pain
Once you're sending links habitually, you still need to find what was shared six months ago. That's where clients with strong search matter — including operator-friendly queries like has:attachment combined with sender or subject filters. Faraday supports those operators and organizes mail so project artifacts aren't buried under newsletters.Attachment limits aren't annoying bureaucracy — they're a forcing function to share files the modern way.