Added request-client-id header to Graph requests for logging and diagnostics.

Many-to-one mode now intelligently combines attachments, CC, and BCC recipients across multiple rows for the same recipient. Read more

Added a sign-in fallback option for a bug in Microsoft Office that leaves the login window blank. Read more

Additional handling for common mistakes made when using individual uploads, specifically file extensions.

Subject lines were sometimes HTML encoded.

Hidden sheets are now ignored, SecureMailMerge will always use the first unhidden sheet available in your workbook.

Two new permissions have been added to the SecureMailMerge app for admin approval: Contacts.Read and Contacts.Read.Shared.

Previously these permissions were granted by the users directly as they do not require admin consent, but to enable organisations that have user consent completely disabled we have added these to the app permissions that the administrator must grant. This does not change any of SecureMailMerges capabilities as outlined on our permissions help page, just the point in time when they are granted. Previously: the admin granted permissions that only the administrator could grant and the user granted the rest. Now: admin grants all permissions required to run SecureMailMerge. Read more

New error message displayed if the spreadsheet contains more than one sheet even if hidden.

Improved handling of empty fields in spreadsheets.

Improved handling of personalization tokens that were (invisibly) modified by Outlook causing personalization errors.

Bug in the scheduling logic that caused some emails to be sent at the wrong time.

Due to a bug in Microsoft Graph API, attachments and images could not be sent between 2025-04-17 and 2025-04-23. The issue has been confirmed by Microsoft, has been resolved and is currently being monitored. Read more

Empty cells in many-to-one tables now show as empty in the email instead of 'undefined'.

License checks for better reliability.

Automatic retries on certain network issues.

Error messages for better troubleshooting.

Issue when large number of columns used in many-to-one mail merges.

Issue when token contained a slash.

Token lifetime handling, so that longer campaigns can be run without re-authenticating.

Support for setting reply-to addresses in campaigns.

Edge scheduling edge case.

Many-to-one merge fields for personalization. Read more

Progress display to indicate which step is currently running.

Retry mechanism for temporary failures during campaigns.

Handling when Outlook has not synced with Microsoft 365 (e.g. template changes).

Custom formatting involving fonts.

New lines (line breaks) in personalization tokens are now automatically converted to HTML line breaks for better formatting.

Tokens embedded in links.

Wrong error message when subject and body were empty.

Spreadsheet issue where emails starting with a number were interpreted as dates.

Prevents backdating email campaigns when scheduling.

Changed error message from Microsoft Graph to explain the issue better.

Left margin issue for some formatting cases.

Copy pasted images not being displayed correctly.

Support added for custom email headers such as List-Unsubscribe. Read more

Display issues with bullet points on Outlook for Mac.

Request delivery receipts for messages. Read more

Now with support for formatting options (dates, currencies) when using Excel.

Trailing semi-colons and spaces which are now removed from the attachments column.

Emails with long local parts that were not validated correctly.

The display of missing attachments to only show the unique file names if the same attachment is used in multiple rows.

Empty rows in the Attachments column causing issues.

Sending as an alias on your own mailbox (Workaround for MS Graph API limit).

Incorrect row number on error messages.

Whitespace in the email recipient field is now ignored.

Define a sending time range for campaigns. Read more

Define a day to start sending for campaigns. Read more

Large campaigns that experience side-effects from throttling.

Unreliable campaign pausing.

Add delay between messages. Read more

Generate mail merge as preview in Drafts folder. Read more

Site-wide search.

Request read receipts for messages. Read more

Send emails with high importance. Read more

CC/BCC usage.

Spreadsheets with empty column headers.

Images in Classic Outlook for Mac.

Copy-pasted images in Outlook for the Web.

Infrastructure upgraded to improve reliability and performance.

Web Outlook when using embedded (base64 encoded) images.

Links can now be populated from the spreadsheet. Read more

Firefox users not being able to authenticate with Microsoft 365.

Intermittent timeout errors when sending attachments.

Support added for default/fallback values for merge fields. Read more

Error reporting in order to help with troubleshooting.

Support added for individual attachments per recipient. Read more

You can now continue previous campaigns stored on your computer.

An issue with the license not loading right away when starting a campaign from the address book.

Contacts loading improved and sorting added.

Contacts from shared mailboxes can now be used to create campaigns. Read more

An issue with inline images in signatures.

Licenses can now be purchased directly through your Microsoft 365 subscription.

Create campaigns from address book contacts.

Public launch of SecureMailMerge the Microsoft Office Store.

SecureMailMerge was tested and verified by Microsoft for AppSource.

Beta of SecureMailMerge released to early testers.