c# - SMTP send email works offline but not online -


i have simple contact page on private homepage.

offline works perfectly, online nothing happens.

any idea?

protected void page_load(object sender, eventargs e) {     if (!ispostback)     {         btnsend.attributes.add("onmouseover", "changeimg('" + btnsend.clientid + "', 'images/senden_hover.jpg');");         btnsend.attributes.add("onmouseout", "changeimg('" + btnsend.clientid + "', 'images/senden.jpg')");     } }  protected void btnsend_click(object sender, imageclickeventargs e) {     if (!string.isnullorempty(txtnachricht.text))     {         sendemailusercontact(txtabsender.text, txtnachricht.text);         response.redirect("~/contact_suc.aspx", false);     } }  public static void sendemailusercontact(string betreff, string nachricht) {     sendemail(betreff, nachricht, "von@exampl.com", "an@example.com"); }  private static void sendemail(string betreff, string nachricht, string von, string an) {         ///zambuu         string strsmtpserver = "smtp.example.com";         string struser = "kontakt@example.com";         string strpasswort = "xxx";          mailmessage mail = new mailmessage();         mailaddress = new mailaddress(von);         mail.to.add(an);         mail.from = from;         mail.subject = betreff;         mail.body = nachricht;          string host = strsmtpserver;         int port = 25;         smtpclient client = new smtpclient(host, port);          networkcredential nc = new networkcredential(struser, strpasswort);         client.credentials = nc;          client.send(mail);         }

i believe smtp have approve sender. machine hosts online contact page, different machine 1 developing on. have give access on mailserver on machine hosts page.


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