Sending emails from MVC application hosted in Azure not working - asp.net-mvc

Question

Ive gone through many posts, but none seem to work.
I have an MVC application hosted in Azure as an app service and sending of mails is not working. It works on my local.
I have my SMTP details stored in my Web.Config:
Web.Config
<appSettings>
<!--To Send Mail-->
<add key="MailServerSMTP" value="mail.appname.com" />
<add key="MailServerSMTP_UserName" value="alerts#appname.com" />
<add key="MailServerSMTP_Password" value="Password" />
</appSettings>
Below is my sending function:
Email sending function
public void SendMessage(string subject, string messageBody, string fromAddress, string toAddress, string ccAddress, string sFileName, string sFileName2)
{
try
{
MailMessage message = new MailMessage();
SmtpClient client = new SmtpClient();
//Thread T1 = new Thread(delegate ()
//{
//Set the sender's address
message.From = new MailAddress(fromAddress);
//Allow multiple "To" addresses to be separated by a semi-colon
if ((toAddress.Trim().Length > 0))
{
foreach (string addr in toAddress.Split(';'))
{
message.To.Add(new MailAddress(addr));
}
}
//Allow multiple "Cc" addresses to be separated by a semi-colon
if ((ccAddress.Trim().Length > 0))
{
foreach (string addr in ccAddress.Split(';'))
{
message.CC.Add(new MailAddress(addr));
}
}
//Set the subject and message body text
if (!string.IsNullOrEmpty(sFileName))
{
Attachment obAttachement = new Attachment(sFileName);
message.Attachments.Add(obAttachement);
}
if (!string.IsNullOrEmpty(sFileName2))
{
Attachment obAttachement = new Attachment(sFileName2);
message.Attachments.Add(obAttachement);
}
message.Subject = subject;
message.Body = messageBody;
message.IsBodyHtml = true;
string path = System.AppDomain.CurrentDomain.BaseDirectory;
path = path.Replace("bin\\Debug\\", "Content\\img");
//if (path.Substring(path.Length - 6) != "Images")
//{
// path = path + "Images";
//}
if (path.GetLast(6) != "Content\\img")
{
path = path + "Content\\img";
}
Attachment ImageAttachment = new Attachment(path + "\\SystemicLogic_Transparent.png");
// Set the ContentId of the attachment, used in body HTML
ImageAttachment.ContentId = "SystemicLogic_Transparent.png";
// Add an image as file attachment
message.Attachments.Add(ImageAttachment);
message.Body = messageBody;
//Set the SMTP server to be used to send the message
//client.Host = "smtp.jumpstartcom.co.za"
string sSMTP_Username = ConfigurationManager.AppSettings["MailServerSMTP_UserName"].ToString();
string sSMTP_Password = ConfigurationManager.AppSettings["MailServerSMTP_Password"].ToString();
string appname = ConfigurationManager.AppSettings["MailServerSMTP"];
client.Credentials = new System.Net.NetworkCredential(sSMTP_Username, sSMTP_Password);
client.Host = appname;
client.Port = 587;
//client.EnableSsl = true;
//Send the e-mail message
//client.SendAsync(message, null);
client.Send(message);
//});
//T1.Start();
}
catch (Exception ex)
{
}
}
I have tried enabling SSL and using port 25. I have tried setting the port to 465 and 587 and emails are not coming through though.
Is there a specific port that needs to be used, or something I am doing wrong ?
Thanks for any help in advance!