What is MailMergeLib?

MailMergeLib version 5 is an SMTP mail client library which provides comfortable mail merge capabilities. MailMergeLib is written in C# and comes with the following features:

Mail message generation

• Email templates can be fully individualized in terms of recipients, subject, HTML and/or plain text, attachments and even headers. Placeholders are inserted as variable names from data source between curly braces like so: {MailboxAddress.Name} or with formatting arguments like {Date:yyyy-MM-dd}.
• HTML text may contain images from local hard disk, which will be automatically inserted as inline attachments.
• For HTML text MailMergeLib can generate a plain text representation.
• Attachment sources can be files, streams or strings.
• The data source for email merge messages to a number of recipients and be any IEnumerable object as well as DataTables. The data source for single emails can be any of the following types: Dictionary<string,object>, ExpandoObject, DataRow, any class instance or anonymous types. For class instances it's even allowed to use the name of parameter less methods in placeholders.
• Placeholders in the email can be formatted much like the features known from string.Format by using SmartFormat.NET. SmartFormat is a fast and lean string parser and formatter, bringing a lot of additional options like conditional output depending on input data.
• Resulting emails are MimeMessages from MimeKit, an outstanding tool for creating and parsing emails, covering all relevant MIME standards.
• Support for international email address format.

Sending email messages

• Practically unlimited number of parallel tasks to send out individualized emails to a big number of recipients.
• SmptClients for each task can get their own preconfigured settings, so that e.g. several mail servers can be used for one send job.
• Progress of processing emails can easily be observed with a number of events.
• SMTP failures can automatically be resolved supplying a backup configuration. This fault-tolerance is essential for unattended production systems.
• Emails are sent using the SmtpClient from MailKit, the sister project to MimeKit. SmtpClient is highly flexible and can be configured for literally every scenario you can think of.
• Instead of sending, emails can also be stored in MIME formatted text files, e.g. if a "pickup directory" from IIS or Microsoft Exchange shall be used. If needed, these files can be loaded back into a MimeMessage from MimeKit.

Save and restore

• Messages and templates can be saved and loaded to/from XML files.
• Configuration settings for messages and SMTP can be stored to and loaded from an XML file.

Both

• Fine grained control over the whole process of email message generation and distribution.
• RFC standards compliant.
• We aks you not to use MailMergeLib for sending unsolicited bulk email.

Supported Frameworks

• .Net Framework 4.6.2 and later
• .Net Standard 2.1
• NET 6.0 and later

Get started

Install the NuGet package

Have a closer look at the MailMergeLib Wiki