Here Mudassar Ahmed Khan has explained how to resolve the error Failure sending email in ASP.Net.

Generally the Failure sending email error comes when debugged leads to the following error:
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required in ASP.Net Application.
Thus this article will cover the common solutions which can resolve the issue.

Here Mudassar Ahmed Khan has explained with an example, how to export Crystal Report to PDF and send as Email Attachment in ASP.Net using C# and VB.Net.

Crystal Report provides function named ExportToStream which exports Crystal Report to Word, Excel, PDF or CSV file in Stream format.

Later the Stream can be used to attach the exported PDF file as Attachment and send as Email.

Here Mudassar Ahmed Khan has explained with an example, how to send Email using HTML Templates in ASP.Net with C# and VB.Net.

HTML Template is nothing but an HTML File whose contents will be read, modified and sent as Email.

HTML Templates are used to send newsletters and promotional emails. Such emails contain Rich Text content, images and animations.

Here Mudassar Ahmed Khan has explained with an example, how to send Email from Trigger in SQL Server.

This article will illustrate how to send email from Trigger using sp_send_dbmail Stored Procedure in SQL Server by using GMAIL SMTP settings.

This article is applicable to following SQL Server versions i.e. 2008, 2008R2, 2012, 2014, 2016 and 2017.