Send large filesstraight from Outlook.No 25 MB limit.
Microsoft 365 caps email attachments at 25 MB. OneDrive forces recipients to log in with Microsoft. ZIP splitters are embarrassing. With SecureFiles you send files of any size right from Outlook, encrypted, without login requirements for recipients, without a new interface.
Why Outlook kills attachments today
The problem is well known. The three common workarounds are all worse than the disease.
25-MB limit hard capped
Microsoft 365 blocks attachments above 25 MB. No matter how big your mailbox is, the Exchange transport service caps.
OneDrive link = login required
External recipients need a Microsoft account or fail the permission check. Customers without a Microsoft environment are locked out.
ZIP splitting is amateurish
Split a file into 20 parts, send by email, have the recipient reassemble, a workflow from 1998. And the recipient-side virus scan often blocks the first part.
WeTransfer is GDPR-risky
Caches in the US, no E2E encryption. Unsuitable for client, patient, or personnel data.
Large attachments are quietly, securely wrapped in the background
You keep working in Outlook as usual, subject line, attachments, signature. SecureFiles detects attachments that are too large or sensitive and silently replaces them with an encrypted link including expiry and optional password.
Works in classic Outlook, new Outlook, and Outlook on the Web.
Recipients need no account, no Microsoft login, no new app.
No fixed size cap. CAD, video, database dumps, it all ships.
Policy engine replaces automatically above a defined size or for classified data.
Three steps to send from Outlook
SecureFiles fits seamlessly into your existing Outlook flow. No second tool, no context switch.
1. Outlook add-in installed
One-time rollout central via Microsoft 365 Admin Center. End users install nothing. Classic, New, and Web Outlook supported.
2. Write the email as always
Compose the email, open the add-in, add the file, send. One click replaces the attachment with an encrypted link.
3. Add-in replaces with a link
The file is uploaded encrypted to SecureFiles infrastructure in the EU, the attachment is replaced with a signed link. Recipient clicks, download. No Microsoft account, no software.
Why SecureFiles beats any workaround
No tool switch, no training, no GDPR risk, on the contrary: more security than native Outlook attachments.
No hard size cap
Enterprise tier supports single attachments of virtually any size. CAD, video editing, database dumps, all work.
Classic + New Outlook + Web
COM add-in for Classic Outlook, Office add-in for New Outlook and Outlook on the Web. One add-in, three clients.
Central admin rollout
Roll out to all employees via Microsoft 365 Admin Center. No end-user installation, no training.
Recipient without account
The recipient needs nothing but the link in your email. No Microsoft, no Dropbox, no Tresorit.
End-to-end encrypted
TLS 1.3 in transit and AES-256 at rest, more secure than a normal email attachment would be anyway.
Malware scan + audit log
Every upload is scanned before release. Audit log shows download events, IP hash, timestamp. GDPR Art. 30 ready.
Outlook workarounds in comparison
Which approach actually scales, for enterprise use.
SecureFiles add-in | Typical workarounds | |
|---|---|---|
| Max. attachment size | No fixed size cap | 25 MB (Outlook native) |
| Login for recipient | Not required | OneDrive: Microsoft account usually required |
| GDPR hosting | EU jurisdiction | OneDrive: US hoster / WeTransfer: US caching |
| End-to-end encryption | TLS 1.3 and AES-256, storage optionally in your own bucket | TLS only |
| Virus scan during transfer | Malware scan standard | Not documented |
| Admin rollout | Centrally via M365 Admin Center | End-user installation required |
| Audit log | Included, GDPR Art. 30 | OneDrive: limited / WeTransfer: hardly any |
This comparison describes operation across a company. For individual users, encryption inside the client remains a workable solution.
FAQ: Send large files by Outlook
Why does Outlook have a 25-MB limit?
Can I simply raise the limit?
How do I install the SecureFiles add-in?
Does it work in the new Outlook?
Does the recipient need to install software?
What happens technically to the file?
Can I roll out the add-in centrally and set policies?
Is there a limit on the number of recipients?
Verwandte Lösungen
WeTransfer-Alternative
DSGVO-konformer Dateiversand aus der EU, ohne CLOUD-Act-Risiko.
Cryptshare-Alternative
Modulare deutsche Alternative mit echtem Zero-Knowledge.
FTP-Alternative
Sicherer Dateitransfer statt FTP — Outlook-Add-in, Audit-Log, NIS-2.
DSGVO-konformer Dateiversand
Verschlüsselter Dateiversand nach Art. 32 DSGVO und NIS-2.
Sicherer Posteingang
Dateien sicher empfangen — persönlicher Upload-Link für Externe.
Datei-Upload-Formular
Dokumente strukturiert anfordern, geführte Checkliste statt E-Mail-Ping-Pong.
SharePoint-Alternative
Sichere gemeinsame Dateiräume für Externe, ohne Microsoft-Cloud.
End ‘attachment too large.'
30-day free pilot. Outlook add-in rolled out in an hour.