SMTP – Page 2 – Chilkat Tech Notes

May 6, 2022

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

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 work. Don’t know why. Perhaps […]

GMail 0 37 sec read

June 9, 2020

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

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, 1.36674:32000000, 1.61250:00000000, 1.45378:3F000000, 1.44866:01000000, 16.55847:A6000000, […]

Office365 0 1 min read

May 26, 2020

Authentication Problem with Sending Email in Office365 using SMTP

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

Office365 0 20 sec read

November 27, 2018

GMail SMTP

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} –sendCmdToSmtp readSmtpResponse: SmtpCmdResp: 534-5.7.14 <https://accounts.google.com/signin/continue?sarp=1&scc=1&plt=AKgnsbsG […]

Uncategorized 0 1 min read

December 20, 2017

Minimizing Time to Send Email

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 examine connectivity and login success […]

Uncategorized 0 2 min read

August 30, 2013

Email “Received” Headers

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 or a program such as […]

Uncategorized 0 49 sec read

February 6, 2012

Return Receipt vs Delivery Receipt when Sending Email (SMTP)

See this Chilkat web page for information about sending email with Return Receipt or Delivery Receipt.

Uncategorized 0 4 sec read

July 21, 2010

Sending Emails with Large Attachments

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 Chilkat Email component. It can […]

Uncategorized 0 47 sec read

March 15, 2010

Sending SMS Text Messages via Email-to-SMS Gateways

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: Send SMS Message Visual Basic: […]

Uncategorized 0 20 sec read

February 18, 2010

Understanding BCC (Blind Carbon Copy)

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 copy — the recipients are […]

Uncategorized 0 33 sec read

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