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Luca
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Joined: 10 November 2003
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| Posted: 01 February 2006 at 3:07pm | IP Logged
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Hi,
is there a way to programmatically set a timeout for the new GetRelayServerFromEmailAddress method? It seems to hang when DNS is unreachable, for some reason, even if I set a very short timeout property to SMTP object. I also tried using a Timer object and setting EnableEvents as True, but had no luck.
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Alex
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Joined: 19 November 2003
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| Posted: 02 February 2006 at 4:20pm | IP Logged
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Could you please provide us with sample code which causes this problem (including DNS name you used, etc). In our tests, it returns empty string very quickly when DNS server is not available.
Regards,
Alex
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Luca
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| Posted: 07 February 2006 at 11:13pm | IP Logged
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The code is really simple:
Dim oMailer As MailBee.SMTP
Set oMailer = New MailBee.SMTP
MsgBox oMailer.GetRelayServerFromEmailAddress("test@hotmail.com")
An easy way to reproduce the behaviour is using a firewall (I use Zone Alarm) and not allowing the compiled exe to connect to the Internet. The firewall asks the user what to do, and the software hangs until it is either blocked or allowed.
A second way is using a wrong DNS address (in the following example I just put a random address), which may not be an uncommon scenario with end users:
MsgBox oMailer.GetRelayServerFromEmailAddress("test@hotmail.com","1 23.45.31.17")
Program hangs for about 10 seconds. I suppose (but haven't tried) the same may happen when DNS address is right, but DNS server is unreachable.
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Alex
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| Posted: 08 February 2006 at 5:20am | IP Logged
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Actually, 6 seconds is ok (I think you get 6 seconds, not 10 seconds). It would be a problem it was minutes or so.
Internally, the method performs the query two times, and waits 3 seconds each time. If it was less than 3 seconds, or it was just only one attempt to query DNS server, the results would not be reliable (the method would often say a particular address is invalid even if it's ok.)
Regards,
Alex
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Luca
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| Posted: 08 February 2006 at 12:45pm | IP Logged
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Thanx Alex. The idea was to use this function in a prog that sends some hundreds of emails; in this case even 6 seconds is quite a lot: so I was planning to use direct send only when the answer is very quick (1 second or less), otherwise switch to smtp relay. But, in order to achieve this, I would need to be able to set a shorter timeout.
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Alex
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Joined: 19 November 2003
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| Posted: 08 February 2006 at 1:29pm | IP Logged
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Thank you for the suggestion.
Please download the update at http://www.afterlogic.com/updates/mailbee.zip
It adds two parameters to GetRelayServerFromEmailAddress method so it now looks like:
GetRelayServerFromEmailAddress(EmailAddress,[DNSServer = ""], [SingleAttemptOnly=False], [Timeout=3])
When used as
Code:
SMTP.GetRelayServerFromEmailAddress("test@hotmail.com","192. 168.0.1",True,1)
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it will use 1 second for timeout value and will attempt to send DNS query only once (no second attempt and attempts to query backup DNS servers will be made).
If the last two parameters are omitted, it works just like I described in my previous posting to keep compatibility with the existing code.
Please let us know if it works as expected.
Regards,
Alex
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Luca
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| Posted: 08 February 2006 at 8:29pm | IP Logged
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Thank you Alex, that was great!
The best thing is that I can obtain the functionality I described with just 1 line of code:
SMTP.ServerName = SMTP.GetRelayServerFromEmailAddress("test@hotmail.com","192. 168.0.1",True,1)
If MX record is not found in 1 second, since the method returns an empty string SMTP relay is automatically used.
By the way, someone may be interested in how stable Mailbee is in large mailings: I've sent about 30.000 mails - don't worry, it's not spam :) - one after another with no performance problem at all; furthermore, since mail merge was used, message has been "reworked" 30.000 times (some other components that I have tested around ended up with messed-up mails or memory leaks).
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Alex
AfterLogic Support
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| Posted: 09 February 2006 at 7:34am | IP Logged
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Great news! Thank you for the valuable feedback.
Regards,
Alex
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