Gmail 421-4.7.0 Errors - email

Trying to post a question, but keeps getting flagged as spam. Attaching an image of the question. Nothing like recursive problems.

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Listed in Razor 2 Nobody on the internet knows an answer

I wanted to start a small campaign of about 400-500 emails and I tested the email with mail-tester.com
The problem is that I've got these 2 errors and nobody on the internet knows an answer for it:
-2.43 RAZOR2_CF_RANGE_E8_51_100 Razor2 gives engine 8 confidence level above 50%
-1.729 RAZOR2_CHECK Listed in Razor2 (http://razor.sf.net/)
This happends for both the domain and subdomain. I tried sending an email with a completely changed text (something about animals I've found on wikipedia) and without signature, I even tried sending an empty email and got the same misterious errors.
I tried sending the exact same mail + signature from another domain and it worked perfectly without any error.
What should I try next, considering the fact that it's impossible to change the domain name?
How popular is SpamAssasin with its Razor 2 or is it maybe irrelevant?
Should I wait or on the contrary send as many emails as possible to detect clean traffic?
Thanks

GNU mailman - questions and testing

I feel really stupid asking this question, but I recently signed up to a GNU mailman list for the first time ever and can't quite figure out how to interact with it properly. I can't find any documentation anywhere on how to participate as a list member. In particular, I am trying to figure out how to make my responses nest properly when replying from a Gmail account. Through some sparse info I've gleaned, I found that the "In-Reply-To" header is supposedly the one that determines where your message nests on the list.
So, I posted a new message to the list, and when somebody replied to me, I received a copy in my Gmail in addition to the post on the list archives page. I replied to the Gmail and addressed it back to the main list address. After sending, I examined the Gmail headers, and In-Reply-To was indeed set to the Message-ID of the person who had replied to me, so I thought my response would be nested under his. Unfortunately, it was not. It was nested underneath my own OP, next to his. I can't figure out why, except that there is another header References, which in my response, included two Message-ID's, both the one from my original post, and the one from the first response.
None of this stuff is intuitive at all or explained anywhere that I can find, and Gmail of course gives you no control of email headers... but I don't want to switch to an entirely new mail service just to interact with a Mailman list. Nor do I want to spam a real list with a bunch of stupid test messages of me figuring out what is probably supposed to be a very simple system. Does anybody know of a test instance of mailman somewhere that I can send a few mails to just so get this all sorted out? I found what appeared to be a couple, but none of them were actually accepting mail.

Can I put star (★) in my email subject?

I got a request from my client that they want to add stars (★) to their email subject (They send these mails through the application we made as a part of bigger CRM for them).
I tried to send a test mail, and the email title is displayed nicely in my Gmail account, and I must agree with my client that it is eye catching, but what came to my mind is that this may be a spam magnet, so I googled about it but I can't find the actual "don't do this".
Generaly, my oppinion would be not to use it, but now I have to explain to the client why. My best explanation whould be there is a probability your emails will be treated as spam but I don't have the background for this statement.
Do you have any suggestions about what should I do?
The only information I could find is on the SpamAssassin page of how to avoid false positives. The only relevant part I found was this part.
Do not use "cute" spellings, Don't S.P.A.C.E out your words, don't put
str#nge |etters 0r characters into your emails.
SpamAssassin is a very widely used spam filtering tool. However, simply breaking one of the rules (strange characters) alone wouldn't get an email marked as spam. But combined with some other problems could lead to your email being considered spam. That being said, if your email is a completely legitimate business email, it's likely that few other rules are triggered, and using the special characters wouldn't create a huge problem. That being said, you should probably try out a couple test emails on SpamAssassin and a couple other spam filtering tools in order to come to a better conclusion on the emails you plan to send out.
Simply explain to your client as you have explained to SO: you stated that the star made it eye catching: this doesn't directly mean that it will be treated as spam, but you could explain how that concept COULD be considered spam.
If the star is part of their branding, however, this could be quite a nice way in which your client expresses themselves.
Spam emails are becoming more and more like what one would consider 'normal', so I think they have trial it internally, test the concept.
Talk it over with your client - there is going to be no basis in hard fact with things like this, purely social perception.
More and more retailers are using unicode symbols in their subject lines since a few months. Of course it's in order to gain more attention in cluttered inboxes. Until now, there has been absolutely no evidence that such symbols increase the likelihood of failing spam filter tests. However, keep in mind that rare symbols might not render (correctly) across all mail user agents. Especially keep an eye on Android and Blackberry smartphones, but also on Outlook. In addition, due to a Hotmail bug symbols will render much bigger in subect lines and in the email body within the web front end. In fact, they are beeing replaced by images. All in all, the star shouldn't make any problems. At least, if it's encoded correctly in the subject line. So, go for it.

PEAR Mail using gmail SMTP won't send 2 emails in sucession

I have PEAR Mail and Mail_mime all working very nicely using gmail's SMTP server to send. Thanks to some posts on here that helped me get that far!
But, in some scenarios, I need to send two emails, with different content, and to different recipients one right after the other. This is refusing to work.
I can confirm both the emails I am trying to send are well-formed and valid, as both will send with the other one commented out. But whenever I attempt to send them both, only the first gets through. I have tried putting php to sleep for 10 seconds in between, and I have tried sending the second email in a different script that gets called after the end of the first. Nothing.
I realise this is a pretty obscure problem as I found no other articles mentioning this. I haven't included any code because, as stated, I know the code works fine.
So I am hoping in vein that someone might have a bright idea as to why this might be.
Thanks in advance.
SOLVED: changing
include('Mail.php');
to
require_once('Mail.php');
fixed the problem.

Why am I getting this WSDL SOAP error with authorize.net?

I have my script email me when there is a problem creating a recurring transaction with authorize.net. I received the following at 5:23AM Pacific time:
SOAP-ERROR: Parsing
WSDL: Couldn't load from 'https://api.authorize.net/soap/v1/service.asmx?wsdl' :
failed to load external entity "https://api.authorize.net/soap/v1/service.asmx?wsdl"
And of course, when I did exactly the same thing that the user did, it worked fine for me.
Does this mean authorize.net's API is down? Their knowledge base simply sucks and provides no information whatsoever about this problem. I've contacted the company, but I'm not holding my breath for a response. Google reveals nothing. Looking through their code, nothing stands out. Maybe an authentication error?
Has anyone seen an error like this before? What causes this?
Maybe as a back up you can cache the WSDL file locally and in case of network issues use the local copy. I doubt it changes often so if you refresh it weekly that should be satisfactory as the file will probably not be stale by then.