asp.net - Error Failure Sending Mail -


i trying send email using asp.net vb. email send through company server. have many suggestion internet error same. 'failure sending mail'

here code far:

protected sub btnsend_click(sender object, e eventargs) handles btnsend.click     try         dim message new mailmessage()         dim client new smtpclient("blablabla@myhost.com")         message.from = new mailaddress(txtfrom.text)         message.to.add(new mailaddress(txtto.text))         message.subject = txtsubject.text         message.body = txtmessage.text         message.isbodyhtml = true         message.priority = mailpriority.high         client.port = 25         client.enablessl = true         client.send(message)         lblinfo.visible = true         lblinfo.text = "your message has been sent"      catch ex exception         lblinfo.visible = true         lblinfo.text = ex.message      end try end sub

and here web.config

<system.net> <mailsettings>   <smtp deliverymethod ="network" from="myemailaddress.com">    <network host="localhost" port="25" defaultcredentials ="true" />   </smtp> </mailsettings>

i tried change enablessl = false, still give me same error.

thanks in advances.

to find exact cause of smtp error, should test smtp server manually using telnet. first, make sure telnet client installed (hint: "turn windows features on , off") start command prompt , type following:

> telnet my.servername.com 25 [enter]

you should welcome message server. type following commands, 1 @ time , pressing [enter] after each line. substitute , addresses accordingly. not type '>' character, represents prompt:

> helo > mail from: user@sending-domain.com > rcpt to: user@recipient-domain.com > data > subject: test > test text goes in body > .

you either message mail queued delivery, in case error lies elsewhere in program, or error message can troubleshoot. causes relaying denied, server unavailable, mailbox full, user doesn't exist, etc.

ps, don't need use built in telnet client, can use other telnet client (ex: putty) if prefer.


Comments

Post a Comment

Popular posts from this blog

ios - Change Storyboard View using Seague -

i have following code checks connection server, , depending on want change views if no connection found. nsstring *connect = [nsstring stringwithcontentsofurl:[nsurl urlwithstring:@"http://myserver.com"] encoding:nsutf8stringencoding error:nil]; if (connect == null) { [self performseguewithidentifier:@"network_failure" sender:self]; } else { // other code here } my problem not change views. have added storyboard segue between 2 views identifier of network_failure . not have navigation controller or that, problem? thanks help! no not problem. first of all, in objectivec exists nil object oriented null . must use that. so: if(connect == nil) or better: if(!connect) so due fact nil not same of null , probably code does't enter in if scope . you have been able discover breakpoint. anyway: be sure set trigger segue (line) 2 view controller , , name network_failure (that not best name. should instead view1toview2 ) as, m...
Read more

commonjs - How to write a typescript definition file for a node module that exports a function? -

consider, toml node module can use: // toml.d.ts declare module toml { export function parse(value:string):any; } declare module "toml" { export = toml; } then: /// <reference path="../../../../../defs/toml/toml.d.ts"/> import toml = require('toml'); toml.parse(...); however, node module export single function, such 'glob' ( https://github.com/isaacs/node-glob ). the node usage of module be: var glob = require("glob") glob("*.js", {}, callback(err, files) { ... }); you'd naively expect this: // glob.d.ts declare function globs(paths:string, options:any, callback:{(err:any, files:string[]):void; ...but because typescripts 'import' semantics bit strange, seems can use 'import .. = require()' statement alias modules . trying call: /// <reference path="../../../../../defs/glob/glob.d.ts"/> import blog = require('glob'); results in: error ts2072: mod...
Read more

openid - Okta: Failed to get authorization code through API call -

i'm integrating okta own idp server using okta's api. i'm implementing authorization code flow following steps below: in own server, use /api/v1/authn endpoint sessiontoken. use sessiontoken obtain authorization calling endpoint: /oauth2/v1/authorize?client_id=" + clientid + "&sessiontoken=" + sessiontoken + "&response_type=code&response_mode=query&scope=openid&redirect_uri=" + redirecturl + "&state=evanyang&nonce=" it's supposed return response status code 302 , location header containing redirect url code value. however, keep getting response status code 200 , without location header, html body saying "you using unsupported browser." , "javascript disabled on browser." according api documentation: http://developer.okta.com/docs/api/resources/oidc.html#authentication-request , sessiontoken parameter sufficient this: an okta one-time sessiontoken. allows api-based ...
Read more