Chilkat v11.3.0 Release Notes

Pinned December 16, 2025

  The main features of this release focus on Chilkat’s Ai class, enabling interactive AI response streaming directly into embedded desktop application browsers. It supports Azure, custom base URLs for OpenAI-compatible providers, and local providers like Ollama. ✨ New Features Ai Real-Time Streaming AI Responses to Embedded Browsers in Desktop Apps — Stream AI responses […]

Chilkat v11.2.0 Release Notes

Pinned November 3, 2025

Previous Version: Chilkat v11.1.0 Release Notes The main addition in v11.2.0 is the Chilkat.Ai class, and the Chilkat.StringBuilder.MarkdownToHtml method. Ai: The Chilkat AI class provides a unified API for interacting with different AI providers: OpenAI, Google, Claude, xAI, Perplexity, and DeepSeek. It provides functionality for conversation management, multimodal inputs, and streaming mode. Markdown to HTML […]

Semantic Versioning Starting with Chilkat 10.0.0

Pinned September 26, 2024

Starting with the v10.0.0 release (end of September 2024), Chilkat moves to standard semantic versioning.   Prior to this release, for various technical reasons, Chilkat was stuck with versions 9.5.0.xx, where only xx changed. For this first leap to semantic versioning, where the major version changes to 10 (from 9), there are no backward incompatible changes.  […]

GMail SMTP with Send-Only Scope? (https://www.googleapis.com/auth/gmail.send)

May 6, 2022 in GMail

Apparently the full permission scope is required to do XOAUTH2 authentication in the SMTP protocol for GMail. See these examples https://www.example-code.com/vbnet/gmail_smtp_oauth2_access_token.asp https://www.example-code.com/vbnet/gmail_smtp_send_using_oauth2_token.asp The full permission scope is “https://mail.google.com/” The send-only scope is: “https://www.googleapis.com/auth/gmail.send” Google claims that it’s possible to send email with the send-only scope, but we’ve found it is  simply possible.  It just doesn’t […]

Office365 SMTP Error: 554 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied;

June 9, 2020 in Office365

Question: I’m trying to send email using SMTP via smtp.office365.com, and I get this error: 554 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied; Failed to process message due to a permanent exception with message Cannot submit message. 0.35250:0A001485, 1.36674:0A000000, 1.61250:00000000, 1.45378:02000000, 1.44866:59020000, 1.36674:0E000000, 1.61250:00000000, 1.45378:5E020000, 1.44866:F8000000, 16.55847:BC030000, 17.43559:0000000024020000000000000000000000000000, 20.52176:140FFA8B1500001000000000, 20.50032:140FFA8B8517001000000000, 0.35180:F1030000, 255.23226:09000000, 255.27962:0A000000, 255.27962:0E000000, 255.31418:F1030000, 0.35250:0300C981, 1.36674:0A000000, 1.61250:00000000, 1.45378:02000000, 1.44866:3A000000, […]

Authentication Problem with Sending Email in Office365 using SMTP

May 26, 2020 in Office365

If SMTP authentication (using login/password) fails for your smtp.office365.com account, then it may be that your account is configured to require MFA (multi-factor authentication).   You may need to change settings to allow for legacy authentication (single-factor auth).   See https://docs.microsoft.com/en-us/azure/active-directory/conditional-access/block-legacy-authentication Also, an app password may be required.  See https://docs.microsoft.com/en-us/azure/active-directory/user-help/multi-factor-authentication-end-user-app-passwords    

GMail SMTP

November 27, 2018 in Uncategorized

Question: I am trying to send email via GMail using the SMTP protocol.  I am sending the correct GMail login credentials, but I get this error: … smtpAuthenticate: login_method: LOGIN auth_login: smtpSendGet2: sendCmdToSmtp: SmtpCmdSent: AUTH LOGIN –sendCmdToSmtp readSmtpResponse: SmtpCmdResp: 334 VXNlcm5hbWU6 –readSmtpResponse –smtpSendGet2 sendCmdToSmtp: SmtpCmdSent: *** –sendCmdToSmtp readSmtpResponse: SmtpCmdResp: 334 UGFzc3dvcmQ6 –readSmtpResponse sendCmdToSmtp: SmtpCmdSent: {PasswordOrCredentials} […]

Minimizing Time to Send Email

December 20, 2017 in Uncategorized

Programmers using Chilkat to send email can do some simple things, and can avoid common mistakes to optimize the time it takes to send an email. 1) A common mistake is when a programmer calls mailman.VerifySmtpConnection and mailman.VerifySmtpLogin prior to actually sending the email. The intent of the Verify methods is for an application to […]

Email “Received” Headers

August 30, 2013 in Uncategorized

When an email is sent, it should contain no “Received” header fields. Each time the email is processed by a mail server along the delivery route, a new Received header field is prepended to the email. The very first Received header is added by the SMTP server that the SMTP client (such as your app […]

Sending Emails with Large Attachments

July 21, 2010 in Uncategorized

Question: I have downloaded the Chilkat Email component for POP3/SMTP.  When I tried to send email by attaching a file of size of  2 MB,  the email is not been sent.  Could you please let me know how I can send large size attachments using the Chilkat component? Answer: There is no limitation in the […]

Sending SMS Text Messages via Email-to-SMS Gateways

March 15, 2010 in Uncategorized

ASP: Send SMS Message SQL Server: Send SMS Message C#: Send SMS Message C++: Send SMS Message MFC: Send SMS Message C: Send SMS Message Delphi: Send SMS Message Visual FoxPro: Send SMS Message Java: Send SMS Message Perl: Send SMS Message PHP: Send SMS Message Python: Send SMS Message Ruby: Send SMS Message VB.NET: […]

Understanding BCC (Blind Carbon Copy)

February 18, 2010 in Uncategorized

When an email is sent with BCC recipients, the BCC email addresses are not listed in the header.   The “To” recipients are listed in the “To” header field, and the “CC” recipients are listed in the “CC” header field, but the BCC recipients are intentionally left out.  This is what makes it a “blind” carbon […]