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Java Forum / General / December 2007Bouncing mails & Java Mail API
If the Java mail is trying to send mail to non-existent mail ID say xyz@pqr.com (or one which has mailbox full) what will happen? Will it try delivering that message for a specified time period? I am getting many error messages from my SMTP server saying - "SMTP; 550 Requested action not taken: mailbox unavailable" Is it something that needs to be tweaked at SMTP level or can I do something to set Java mail API properties such that retry time is less. This problem is slowing down my system with too many open connections. I am wondering what I can do - though we do email ID validation, there is no way at the moment to see if mailbox is really available or not. What can I do here? Any pointers, help would be highly appreciated. - Manish > If the Java mail is trying to send mail to non-existent mail ID say > xyz@pqr.com (or one which has mailbox full) what will happen? Will it try [quoted text clipped - 7 lines] > what I can do - though we do email ID validation, there is no way at the > moment to see if mailbox is really available or not. What can I do here? Why are you maintaining open connections? There is nothing more you can do, the mail has been sent and has bounced. The 550 response means "do not try again". Read rfc2821 section 4.2.1. There is no way to know in advance whether mail to a given address will succeed. /gordon -- On Tue, 18 Dec 2007 12:17:05 +0530, "Manish Hatwalne" <manish@nospam.yahoo.com> wrote, quoted or indirectly quoted someone who said : >Will it try >delivering that message for a specified time period? It is a relay system. JavaMail when you run your app makes a stab at ending the mail to your mail server. The mail server accepts mail even if the recipient mailserver is down. The mail server will try over a period of days to deliver it. If it fails it sends you a bounce email. However if the mailserver can tell right away it is hopeless (e.g. no such domain) it can refuse to accept the email right when you app first sends it.  SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > It is a relay system. JavaMail when you run your app makes a stab at > ending the mail to your mail server. The mail server accepts mail [quoted text clipped - 3 lines] > hopeless (e.g. no such domain) it can refuse to accept the email right > when you app first sends it. Thanks Roedy Green!! That's all i wanted to know, I know what to do now! - Manish >If the Java mail ...I am getting many error >messages from my SMTP server saying - "SMTP; 550 Requested action not >taken: mailbox unavailable" Maybe you should not have been buying lists from spamfest sources. ..hmm? SignatureAndrew Thompson http://www.physci.org/ > Maybe you should not have been buying lists from > spamfest sources. ..hmm? Huh??? It's the spam we are getting from automated BOTs. we don't send any mails on our own unless the user initiates such request himself, this feature is for referrals and it is being misused. I think I'd add CAPTCHA to take care of this. - Manish > > Maybe you should not have been buying lists from > > spamfest sources. ..hmm? [quoted text clipped - 8 lines] > > - Manish Hi Manish: Please don't take Andrew Thompson too much to heart. Despite being knowledgeable in Java, he is also seemingly an arrogant, nasty person who thinks he knows it all. I believe that he really hasn't found himself yet, and beating up on other people is his way of getting his kicks. For example, he knows every person that multiposts and lets them know about it. Can you imagine the amount of time that requires? Man, I wish I had that kind of free time... Sorry, Andrew - I am calling it the way I (and presumably others) see it. You can fire back at me if you wish. Go ahead, take your best shot...I'll probably get a kick outta your response... Mike. > > Maybe you should not have been buying lists from > > spamfest sources. ..hmm? .. > Huh??? My bad. * > It's the spam we are getting from automated BOTs. we don't send any mails on > our own unless the user initiates such request himself, this feature is for > referrals and it is being misused. I think I'd add CAPTCHA to take care of > this. * When I started that reply, I had in mind to give you a gentle 'prod' that you had not done/said anything to justify that the addresses used were in any way valid - and were 'rubbish'**. It occured that a 'good example' of bad addresses might be from 'purchased lists'. Somehow, through my extremely poor communication skills, that translated to an 'accusation' in my actual words. My apologies. ** Now I reread this thread it seems I completely missed the point from the outset! Glad you got it sorted, BTW. > If the Java mail is trying to send mail to non-existent mail ID say > xyz@pqr.com (or one which has mailbox full) what will happen? Will it try > delivering that message for a specified time period? JavaMail is a purely client system, it has no ability to "retry". Retrying is a function of a mail transfer agent (MTA). > I am getting many error > messages from my SMTP server saying - "SMTP; 550 Requested action not > taken: mailbox unavailable" A 5xx return status is a permanent error. To retry sending the same message would be a violation of the SMTP. Your mail server has done what it is supposed to do, it has passed on the rejection to you so you know that your message cannot be delivered. Because the failure was permanent your mail server will not retry sending it. If you do somehow manage to keep resending the message then you are likely to get yourself or your ISP blacklisted very quickly. If your hacks get your ISP blacklisted you can assume what will happen to your account with them. > Is it something that needs to be tweaked at SMTP level or can I do something > to set Java mail API properties such that retry time is less. JavaMail doesn't retry. To have messages stored and forwarded you need a MTA. That MTA should never retry a rejected message. > This problem > is slowing down my system with too many open connections. I am wondering > what I can do - though we do email ID validation, there is no way at the > moment to see if mailbox is really available or not. What can I do here? Why do you have an open connection? When you receive a 5xx notification the mail server you were connected to has done its job, it's told you the mail cannot be delivered, don't retry. Move onto the next recipient/message. SignatureNigel Wade, System Administrator, Space Plasma Physics Group, University of Leicester, Leicester, LE1 7RH, UK E-mail : nmw@ion.le.ac.uk Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555 Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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