blocks|key|4360860|text|当对多个收件人组使用SendGrid的Personalization时，您需要定义multiple+1st-level+objects+within+the+Personalization+array。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4360861|因此，不是：|4360862|{"personalizations":+[
{"to":+[
++++{"email":+"recipient1@example.com"},
++++{"email":+"recipient2@example.com"}
]}]}|code-block|syntax|javascript|4360863|它们都将是可彼此看见的公共To:阵列，|style|CODE|4360864|您需要：|4360865|{"personalizations":+[
{"to":+[{"email":+"recipient1@example.com"}]},
{"to":+[{"email":+"recipient2@example.com"}]}
]}|4360866|在每个个性化级别中，您可以自定义内容、主题、替换标记，几乎所有内容。|4360867|因此，您可以构建完整的个性化，并遍历这些1000次。一旦你有了1000个收件人，将他们捆绑到一个API调用中，然后发送它。|4360868|entityMap|0|LINK|mutability|MUTABLE|url|https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/personalizations.html#-Sending-Two-Different-Emails-to-Two-Different-Groups-of-Recipients^0|15|1N|0|0|0|0|D|3|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|19|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1A|8|@$A|1B|B|1C|M|N]]|9|@]|C|$]]|$1|O|3|P|5|6|7|1D|8|@]|9|@]|C|$]]|$1|Q|3|R|5|H|7|1E|8|@]|9|@]|C|$I|J]]|$1|S|3|T|5|6|7|1F|8|@]|9|@]|C|$]]|$1|U|3|V|5|6|7|1G|8|@]|9|@]|C|$]]|$1|W|3|-4|5|6|7|1H|8|@]|9|@]|C|$]]]|X|$Y|$5|Z|10|11|C|$12|13]]]]

When using SendGrid's Personalizations with multiple recipient groups, you need to define <a href="https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/personalizations.html#-Sending-Two-Different-Emails-to-Two-Different-Groups-of-Recipients" rel="noreferrer">multiple 1st-level objects within the Personalization array</a>.

So instead of:

<pre><code>{"personalizations": [
{"to": [
 {"email": "recipient1@example.com"},
 {"email": "recipient2@example.com"}
]}]}
</code></pre>

which will all be a common <code>To:</code> array that can see each other,

You want:

<pre><code>{"personalizations": [
{"to": [{"email": "recipient1@example.com"}]},
{"to": [{"email": "recipient2@example.com"}]}
]}
</code></pre>

Within each personalization level, you can customize the content, subject, substitution tags, pretty much everything.

So you can build out the full personalization, and iterate through those 1000 times. Once you have your 1000 recipients, bundle them into a single API call, then send that.

blocks|key|4361185|text|为了构建@jacobmovingfwd，这里有一个Python示例，它使用个性化的"+To“字段将相同的电子邮件发送给多个收件人。我已经测试了代码，它对我来说是有效的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4361186|#+Given+a+list+of+email+addresses+that+are+strings
sublist+=+[...]++++

mail+=+Mail()

for+to_email+in+sublist:
++++#+Create+new+instance+for+each+email
++++personalization+=+Personalization()
++++#+Add+email+addresses+to+personalization+instance
++++personalization.add_to(Email(to_email))
++++#+Add+personalization+instance+to+Mail+object
++++mail.add_personalization(personalization)

#+Add+data+that+is+common+to+all+personalizations
mail.from_email+=+Email(from_email)
mail.subject+=+subject
mail.add_content(Content('text/plain',+message_txt))
mail.add_content(Content('text/html',+message_html))

#+Send
sg+=+sendgrid.SendGridAPIClient(apikey=os.environ.get('SENDGRID_API_KEY'))
response+=+sg.client.mail.send.post(request_body=mail.get())|code-block|syntax|javascript|4361187|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To build on @jacobmovingfwd, here's an example in Python that sends the same email to multiple recipients with individualized "to" fields. I've tested the code, and it works for me.

<pre><code># Given a list of email addresses that are strings
sublist = [...] 

mail = Mail()

for to_email in sublist:
 # Create new instance for each email
 personalization = Personalization()
 # Add email addresses to personalization instance
 personalization.add_to(Email(to_email))
 # Add personalization instance to Mail object
 mail.add_personalization(personalization)

# Add data that is common to all personalizations
mail.from_email = Email(from_email)
mail.subject = subject
mail.add_content(Content('text/plain', message_txt))
mail.add_content(Content('text/html', message_html))

# Send
sg = sendgrid.SendGridAPIClient(apikey=os.environ.get('SENDGRID_API_KEY'))
response = sg.client.mail.send.post(request_body=mail.get())
</code></pre>

blocks|key|4361227|text|这是一个C#版本，它克隆了每个收件人的个性化信息，但仍然只有一个SendGrid+API调用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4361228|++++public+static+void+SendEachReceipient(SendGridMessage+msg,+IEnumerable<string>+recipients)
++++{
++++++++if+(msg+==+null+%7C%7C+recipients+==+null+%7C%7C+!recipients.Any())
++++++++++++return;

++++++++if+(msg.Personalizations+==+null)+//can+easily+be+null+if+no+substitutions+have+not+been+added
++++++++++++msg.Personalizations+=+new+List<Personalization>();

++++++++var+substitutionsCopy+=+msg.Personalizations.FirstOrDefault()?.Substitutions;+//all+substitutions+(if+any)+are+always+all+contained+in+the+first+personalization
++++++++msg.Personalizations.Clear();+//we+will+start+fresh+-+one+personalization+per+each+receipient+to+keep+emails+private+from+each+other

++++++++foreach+(var+email+in+recipients.Where(x+=>+!string.IsNullOrEmpty(x)).Distinct())
++++++++{
++++++++++++var+personalization+=+new+Personalization();
++++++++++++personalization.Substitutions+=+substitutionsCopy;
++++++++++++personalization.Tos+=+new+List<EmailAddress>()+{+new+EmailAddress(email)+};
++++++++++++msg.Personalizations.Add(personalization);
++++++++}

++++++++var+result+=+new+SendGridClient("api-key").SendEmailAsync(msg).Result;
++++}|code-block|syntax|javascript|4361229|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's a C# version that clones Personalization for each recipient to be mailed separately, but still with a single SendGrid API call: 

<pre><code> public static void SendEachReceipient(SendGridMessage msg, IEnumerable&lt;string&gt; recipients)
 {
 if (msg == null || recipients == null || !recipients.Any())
 return;

 if (msg.Personalizations == null) //can easily be null if no substitutions have not been added
 msg.Personalizations = new List&lt;Personalization&gt;();

 var substitutionsCopy = msg.Personalizations.FirstOrDefault()?.Substitutions; //all substitutions (if any) are always all contained in the first personalization
 msg.Personalizations.Clear(); //we will start fresh - one personalization per each receipient to keep emails private from each other

 foreach (var email in recipients.Where(x =&gt; !string.IsNullOrEmpty(x)).Distinct())
 {
 var personalization = new Personalization();
 personalization.Substitutions = substitutionsCopy;
 personalization.Tos = new List&lt;EmailAddress&gt;() { new EmailAddress(email) };
 msg.Personalizations.Add(personalization);
 }

 var result = new SendGridClient("api-key").SendEmailAsync(msg).Result;
 }
</code></pre>

I want to send an email to multiple recipients. 

I used <a href="https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/personalizations.html" rel="nofollow noreferrer">personalizations</a>, but everyone's emails appears on the "to" field, which violates their privacy. 

I don't want to use BCC as this often goes straight to junk (e.g. <a href="http://www.standss.com/blog/index.php/why-you-should-avoid-using-bcc-for-emails/" rel="nofollow noreferrer">http://www.standss.com/blog/index.php/why-you-should-avoid-using-bcc-for-emails/</a>). 

Therefore my question is, how can I send an email to multiple recipients without everyones emails appearing on the "to" field. 

My only alternative I can see is send a separate request to the API for each and every email using a loop which is very resource intensive and time consuming when I have a lot of emails to send!

SendGrid: Sending an email to multiple recipients without other emails being shown on the "to" field

我想向多个收件人发送一封电子邮件。我用的是，但每个人的电子邮件都会出现在“收件人”栏上，这侵犯了他们的隐私。我不想使用密件抄送，因为这通常会直接变成垃圾(例如)。因此，我的问题是，我如何向多个收件人发送电子邮件，而每个人的电子邮件都显示在“收件人”字段中。我能看到的唯一的选择是使用循环为每一封电子邮件发送一个单独的请求...

问SendGrid:向多个收件人发送电子邮件，其他电子邮件不会显示在“收件人”字段中
EN

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