Email Attachments in Campaigns
WarmySender does not support file attachments in campaign emails. This is an intentional design decision based on email deliverability best practices.
Why No Attachments:
- Attachments dramatically increase the chance of your email landing in spam or being blocked entirely. Most spam filters flag emails with attachments from unknown senders.
- File size increases email load time and can trigger rate limits from email providers.
- Attachments are one of the top spam signals for Gmail, Outlook, and other major providers.
- For cold outreach, attachments reduce open rates because recipients are wary of files from unknown senders.
Recommended Alternatives:
- Link to a hosted file — Upload your PDF, brochure, or document to Google Drive, Dropbox, or your website, and include the link in your email. This is the safest approach.
- Use a landing page — Create a simple landing page with your content and link to it. This also lets you track who visits.
- Include key information in the email body — Instead of attaching a proposal or one-pager, include the most important points directly in your email text.
- Follow up with attachments after a reply — Once a prospect replies and you have a relationship established, you can attach files in your direct reply from the Unified Inbox or your email client.
Best Practice: Treat your first cold email as a conversation starter, not a presentation. Save the detailed materials for after you have the prospect's attention and permission.
Note: If you want to add inline images (logos, screenshots, banners) to your emails, WarmySender does support this — see the 'Images in Campaign Emails' guide for details.