BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  POP3 - deleting e-mails          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Uffe Kousgaard Guest Posted: Thu Feb 19, 2004 9:48 pm    Post subject: POP3 - deleting e-mails Consider this scenario: count:= idPOP3.CheckMessages; // Do some checks, decide that message 2 out of 5 has to be deleted. In the meantime one more e-mail has arrived. Will message 2 still be the same one? idPOP3.delete(2); When I look at the source code for the delete command, it just sends the number directly to the server, so how can we be sure what happens, if new e-mails arrive or other applications also delete e-mails? Such as a mail client would normally do. TIA Uffe Back to top eshipman Guest Posted: Thu Feb 19, 2004 10:01 pm    Post subject: Re: POP3 - deleting e-mails In article <40352f3b$2 (AT) newsgroups (DOT) borland.com>, "Uffe Kousgaard" <look_at_www.routeware.dk> says... Quote: Consider this scenario: count:= idPOP3.CheckMessages; // Do some checks, decide that message 2 out of 5 has to be deleted. In the meantime one more e-mail has arrived. Will message 2 still be the same one? idPOP3.delete(2); When I look at the source code for the delete command, it just sends the number directly to the server, so how can we be sure what happens, if new e-mails arrive or other applications also delete e-mails? Such as a mail client would normally do. I suppose that you will need to write code to make sure that the Message-ID is the same as the one you want to delete. Back to top Chad Z. Hower aka Kudzu Guest Posted: Thu Feb 19, 2004 10:05 pm    Post subject: Re: POP3 - deleting e-mails "Uffe Kousgaard" <look_at_www.routeware.dk> wrote in news:40352f3b$2 @newsgroups.borland.com: Quote: // Do some checks, decide that message 2 out of 5 has to be deleted. In the meantime one more e-mail has arrived. Will message 2 still be the same one? idPOP3.delete(2); When I look at the source code for the delete command, it just sends the number directly to the server, so how can we be sure what happens, if new e-mails arrive or other applications also delete e-mails? Such as a mail client would normally do. POP3 is transactional. Message numbers do not change while you are connected, and new mail will not be seen either. -- Chad Z. Hower (a.k.a. Kudzu) - http://www.hower.org/Kudzu/ "Programming is an art form that fights back" Want more Indy stuff? Try the Atozed Indy Portal at http://www.atozedsoftware.com/ * More Free Demos * Free Articles * Extra Support Back to top Uffe Kousgaard Guest Posted: Thu Feb 19, 2004 10:09 pm    Post subject: Re: POP3 - deleting e-mails "Chad Z. Hower aka Kudzu" <cpub (AT) hower (DOT) org> wrote Quote: POP3 is transactional. Message numbers do not change while you are connected, and new mail will not be seen either. Thanks a lot. Back to top Remy Lebeau (TeamB) Guest Posted: Thu Feb 19, 2004 10:26 pm    Post subject: Re: POP3 - deleting e-mails "Uffe Kousgaard" <look_at_www.routeware.dk> wrote Quote: In the meantime one more e-mail has arrived. Will message 2 still be the same one? Yes. The message is not actually deleted from the mailbox until your client disconnects from the server. Until that time, the message is simply marked for deletion and still physically exists, but it is not actually deleted yet, although any further operations on that message will fail from that moment on. Quote: how can we be sure what happens, if new e-mails arrive or other applications also delete e-mails? Because the POP3 protocol specs dictate what should happen. First off, multiple clients can't log in at the same time anyway, email servers don't allow that. When new email is added while you are still logged in, it is simply added to the end of the mailbox, existing messages are not touched. Gambit Back to top Alex Brainman Guest Posted: Fri Feb 20, 2004 2:02 am    Post subject: Re: POP3 - deleting e-mails Remy Lebeau (TeamB) wrote: Quote: Yes. The message is not actually deleted from the mailbox until your client disconnects from the server. AFAIR, you must issue "QUIT" command for that, simple disconnect does not removes "pending deleted" messages. Alex Back to top Remy Lebeau (TeamB) Guest Posted: Fri Feb 20, 2004 4:02 am    Post subject: Re: POP3 - deleting e-mails "Alex Brainman" <brainman (AT) sussan (DOT) com.au> wrote Remy Lebeau (TeamB) wrote: Quote: you must issue "QUIT" command for that TIdPop3.Disconnect() does exactly that. Gambit Back to top Alex Brainman Guest Posted: Fri Feb 20, 2004 4:20 am    Post subject: Re: POP3 - deleting e-mails Remy Lebeau (TeamB) wrote: Quote: you must issue "QUIT" command for that TIdPop3.Disconnect() does exactly that. It might well do "under the hood", but you said: Quote: ... The message is not actually deleted from the mailbox until your client disconnects from the server. ... and that is not quite the same. Furthermore, the fact that Indy POP3 component "hides" the event as important as "Commit all those changes to my mail box I've done just now" is just bit sus ... what if I change my mind and do NOT want to commit, but leave all my deleted messages intact? Alex Back to top Chad Z. Hower aka Kudzu Guest Posted: Fri Feb 20, 2004 5:37 am    Post subject: Re: POP3 - deleting e-mails "Alex Brainman" <brainman (AT) sussan (DOT) com.au> wrote in news:40358b0f (AT) newsgroups (DOT) borland.com: Quote: Furthermore, the fact that Indy POP3 component "hides" the event as important as "Commit all those changes to my mail box I've done just now" is just bit sus ... what if I change my mind and do NOT want to commit, but leave all my deleted messages intact? The POP3 protocol does not support that. The only way to do that is just drop the connection - which will cause POP3 servers to think there was an error and back out. But that its NOT the intended design or how POP3 is meant to work. Thats just error recovery. If you dont want messages deleted - dont delete them. This is a safeguarde of POP3 - NOT a feature set. -- Chad Z. Hower (a.k.a. Kudzu) - http://www.hower.org/Kudzu/ "Programming is an art form that fights back" Want to keep up to date with Indy? Join Indy News - it free! http://www.atozed.com/indy/news/ Back to top Alex Brainman Guest Posted: Sun Feb 22, 2004 10:29 pm    Post subject: Re: POP3 - deleting e-mails Chad Z. Hower aka Kudzu wrote: Quote: ... This is a safeguarde of POP3 - NOT a feature set. You can play with words, Chad ... <BG> Alex Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Internet Winsock All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.