电子邮件在本地发送，但在托管时不发送

Question

net网站，其中包含发送电子邮件的表单。当我在本地测试此表单并按提交时，一切正常，但是当我在Microsoft Azure上托管网站时，每次都无法发送电子邮件。

Http代码：

<form method="post" enctype="multipart/form-data" asp-controller="Front" asp-action="Index">

            <div id="namebox">
                <label asp-for="Name">Name:</label>
                <input asp-for="Name" type="text" placeholder="ENTER YOUR NAME">
                <span asp-validation-for="Name" class="text-danger"></span>
            </div>

            <div id="emailbox">
                <label asp-for="Email">Email:</label>
                <input asp-for="Email" type="email" placeholder="ENTER YOUR EMAIL ADDRESS">
                <span asp-validation-for="Email" class="text-danger"></span>
            </div>

            <div id="phonebox">
                <label asp-for="Phone">Phone:</label>
                <input asp-for="Phone" type="tel" placeholder="ENTER YOUR PHONE NUMBER">
                <span asp-validation-for="Phone" class="text-danger"></span>
            </div>

            <div id="enquirybox">
                <label asp-for="Enquiry">Enquiry:</label>
                <select asp-for="Enquiry" asp-items="Model.PossibleEnquiry"></select>
            </div>
            <label asp-for="Message">Your Message:</label>
            <textarea asp-for="Message" placeholder="ENTER YOUR MESSAGE"></textarea>
            <span asp-validation-for="Phone" class="text-danger"></span>

            <input type="submit" value="SUBMIT">

        </form>

电子邮件发件人代码：

try
        {
            SmtpClient client = new SmtpClient("smtp.office365.com", 587)
            {
                UseDefaultCredentials = false,
                EnableSsl = true,
                Credentials = new NetworkCredential(-->account, -->password, "office365.com")
            };

            MailMessage mailMessage = new MailMessage
            {
                From = new MailAddress(-->account),
                Subject = subject,
                Body = message
            };
            mailMessage.To.Add(new MailAddress(-->email));

            client.Send(mailMessage);
        }
        catch
        {
            _logger.LogError("Email message failed to send.");
        }