MailStore Version 25.3: Indexing of E-invoices and OAuth2 for SMTP Connection to Microsoft 365

We’d like to present a new version of our email archiving software today: Version 25.3 of MailStore Server, the MailStore Service Provider Edition (SPE) and MailStore Home is now available.

New Features in MailStore Version 25.3

With MailStore 25.3, you can look forward to indexing of digital invoice formats and a new SMTP connection type for Microsoft 365.

MailStore Indexes E-invoice Formats

E-invoices sent by email have always been able to be archived with MailStore. Digital invoice formats such as ZUGFeRD or XRechnung are now fully indexed in MailStore V25.3 to make it easier to find e-invoices in the archive using the search function. You can find out more about the role of email archiving in relation to e-invoices in our blog article.

New SMTP Connection Type With OAuth2 for Microsoft 365

Microsoft 365 users can look forward to a new SMTP connection type in MailStore V25.3. The new SMTP connection type supports OAuth2 authentication for sending emails via Microsoft 365. The previous “Standard” setting will no longer be supported from September 2025.

Further Improvements for Increased Security and Usability

In order to continue offering the highest level of security, some third-party components have been updated in MailStore version 25.3.

In addition, the validity period of new certificates for the Microsoft 365 Entra ID integration has been increased to 10 years and some bugs have been fixed.

In MailStore V25.3, the email client Windows Live Mail is no longer supported and other components that are no longer required have been removed.

All other changes and news will be published in our release notes.

Updated Certification: Meeting Data Privacy Requirements

As usual, the latest version of our software, Version 25.3 of MailStore Server and the MailStore SPE, has been certified by an independent data privacy expert.

The certification takes into account all relevant aspects of the European General Data Protection Regulation (GDPR) and affirms that, when used appropriately, both MailStore Server and the MailStore SPE meet all the requirements governing the processing of personal data set out in the GDPR.

As soon as it is available you can request a copy of the official GDPR audit certificate from [email protected].

Registered MailStore partners can download the certificates from our Partner Portal or request it by email from [email protected] as soon as they are available.

Availability

You can download the new version of MailStore Server, the MailStore Service Provider Edition and MailStore Home free of charge from our website.

If your MailStore Server Update & Support Service has expired, please contact us to purchase an upgrade that will allow you to use the latest version of MailStore Server. Read here to find out about other good reasons for having an active Update & Support Service in place.

Interested companies can also download MailStore Server Version 25.3 as part of a free, 30-day trial. If you are an MSP and are interested in offering email archiving as a service based on the MailStore SPE, please contact our sales team at [email protected]. Alternatively, you can sign up as an authorized MailStore Partner with us right now for free.

Click Here for the Corresponding Changelogs

• MailStore Server: https://www.mailstore.com/en/products/mailstore-server/changelog/
• MailStore SPE: https://www.mailstore.com/en/products/mailstore-spe/changelog/
• MailStore Home: https://www.mailstore.com/en/products/mailstore-home/changelog/

Detailed information on recent versions can be found here:

• • MailStore Version 25.2: Support for OAuth Authentication for Outlook.com and Email Archiving for NoSpamProxy Users
  • MailStore Version 25.1: Increased Security and Support for Microsoft Server 2025 and Microsoft Outlook 2024
  • MailStore Version 24.4: New MailStore App for Outlook
  • MailStore V24.3: Improved Search Function
  • MailStore V24.2.2: Now Available
  • MailStore V24.2.1: Hotfix!
  • MailStore V24.2 Multi-Factor Authentication for Synchronized Users
  • MailStore V23.4: Archiving of NDRs and Option to Delete Flagged Emails
  • MailStore V23.3: Easy Importing of Archive Mailboxes From Microsoft Exchange Online (Microsoft 365) and Exchange Server, as Well as Improved Retention Policies