Error: Service not available, closing transmission channel. The server response was: 4.7.0 Temporary System Problem. Try again later in ASP.Net

Preet

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User: Preet
Posted: on Oct 01, 2017 11:05 PM
Forum: ASP.Net Web Forms
Answer: 1
Views: 13417

I am sending mass email using SMTP referencing Send Bulk (Mass) Email in ASP.Net using C# and VB.Net but it is very slow. It takes 30s to send 5 emails:( I tried using thread in sendmail function that seems fast but after sending 10-12 emails it throws exception:

An unhandled exception of type 'System.Net.Mail.SmtpException' occurred in System.dll Additional information: Service not available, closing transmission channel. The server response was: 4.7.0 Temporary System Problem. Try again later (WS). u12sm5363862pfg.146 - gsmtp

and rest of the emails remains unsent. Dont know whats wrong. Any help regarding this would be appreciated. Thanks!!

Download FREE API for Word, Excel and PDF in ASP.Net

kalpesh

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User: kalpesh
Replied: on Oct 01, 2017 11:30 PM
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Hi Preet,

Refer the below links for your reference.

Preet

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User: Preet
Replied: on Oct 01, 2017 11:46 PM
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Hi Kalpesh..

Thanks for the help. Actually my application running on local server dont have any hosting company. I tried it on localhost. Am i missing something? or you talking about the smtp.gmail.com host? sorry m not getting it.

dharmend...

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User: dharmendr
Replied: on Oct 02, 2017 02:32 AM
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Hi Preet,

Refer below link.

https://stackoverflow.com/questions/39097834/gmail-smtp-error-temporary-block

Preet

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User: Preet
Replied: on Oct 02, 2017 06:31 PM
Modified: on Oct 02, 2017 07:38 PM
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Okay, Thanks Dharmendr, will check this.

Actually cant use outlook. Is there any way i can speed up the existing code and prevent error in any other way. Thanks

dharmend...

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ANSWER
User: dharmendr
Replied: on Oct 02, 2017 11:13 PM
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No there is no other way.

You can approach the mail provider for a service account to sent more email from the account.

I agree, here is the link: https://www.e-iceblue.com/Introduce/spire-office-for-net-free.html

Error: Service not available, closing transmission channel. The server response was: 4.7.0 Temporary System Problem. Try again later in ASP.Net

The server response was smtp.cyquator.com. Service not available closing transmission channel

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